KE2 EvapOEM User manual

© Copyright 2023 KE2 Therm Solutions, Inc., Washington, Missouri 63090
KE2 EvapOEM
Alarm Troubleshooting Guide Q.1.61 January 2023
thermsolutions
21214V3.0
Users are notied of alarms in multiple ways, described below.
From the face of the Basic Display:
The alarm is shown as a three digit code on the Basic Display, and the yel-
low or red LED light on the right side of the display will illuminate. If there
is more than one alarm present at the same time, press to cycle through
the alarms.
Alarm Severity:
Red LED: Critical Alarm - The controller will close the electric
expansion valve (EEV) to prevent compressor damage. This will
likely prevent refrigeration from continuing, but the con-
troller is attempting to prevent a catastrophic system fail-
ure, such as damage to the compressor. Critical alarms
must be addressed immediately.
Yellow LED: Cautionary Alarm - The controller will con-
tinue to function to the best extent possible given the
system conditions, but the alarm should be addressed
as soon as possible.
On the controller’s webpage:
Alarms can also be viewed in the top right-hand side of
the controller’s webpage as a pulsing yellow or red bell
when connected to the controller via a smart device (smartphone, tablet,
PC etc.), or remotely via KE2 SmartAccess. When not in alarm, no bell is dis-
played.
If the controller is connected to the internet, the KE2 Evap OEM can also send
text messages and/or emails to immediately notify all necessary personnel
of the alarm condition.
Alarm thresholds such as high temp and door alarm can be adjusted, and
should be set so as not to trigger
during normal loading and use.
Almost all alarms will automati-
cally clear once the alarm con-
dition no longer exists. To clear
an alarm manually, press and
hold until tS (temperature
Setpoint) appears, press sev-
eral times to CLA (CLear Alarm),
press and hold until the
red LED blinks, then release.
Power cycling the controller to
clear alarms is not recommend-
ed, but will also reset the alarm
conditions.
Clearing alarms before calling
technical support will make
diagnosis more dicult or im-
possible; please call technical
support before clearing alarms
if assistance is required.
Note: If the alarm is a sensor
alarm and the sensor is still dis-
connected or shorted, the alarm
will immediately reappear.
Troubleshooting:
Video 034 – Iced Evaporator Coil on a Walk-in Freezer
Video 044 – Iced Evaporator Coil on a Walk-in Cooler
Video 107 –Troubleshooting a Temperature Sensor
Video 106 –Troubleshooting a PressureTransducer
Introduction:
The KE2 Evap OEM has advanced communications and alarming features, never
before seen in the refrigeration industry. These alarms provide early indications of
a poorly performing refrigeration system.
Text messages and/or email alerts provide notication of system issues
immediately, whether on-site or remote, as long as there is an internet connection.
Advanced alarming, diagnostic and troubleshooting are key features of the
KE2 Evap OEM controller, and help prevent catastrophic failures. This protects
contractor, owner, product, and refrigeration equipment.
When using KE2 SmartAccess, the controllers can be viewed, setpoints changed, and defrosts initiated remotely; saving time and frustration. In addition,
your home oce or KE2 Therm technical support can even login with you to diagnose the system in real time.
Alarm Notications:
Basic setup:
Video 068 – How to Determine Proper Coil Sensor Location
Video 069 – How to Properly Install a Coil Sensor
These videos are relevant when troubleshooting
or for basic setup of your controller.

KE2 EvapOEM
Alarm Troubleshooting Guide
Q.1.61 January 2023
Page 2
© Copyright 2023 KE2 Therm Solutions, Inc., Washington, Missouri 63090 21214V3.0
Alarms & Notications List
Alarm Type Abbreviation Scrolling Text* Full Name Description Page
Display
Blank Display No LEDs are illuminated on the display. Page 4
Ed Intro Mode “Ed” on display, yellow and red LEDs ashing. Page 4
PrF PrF N/A Process Failure KE2 Basic Display not able to communicate with controller. Page 4
Sensor Alarms
PSA PSA PRESSURE SENSOR Pressure Sensor Alarm Suction pressure sensor is shorted, open, or pressure out of
range. Page 5
SSA SSA SUCTION TEMP
SENSOR Suction Sensor Alarm Suction temperature sensor is shorted or open. Page 6
ASA ASA AIR TEMP SENSOR Air Sensor Alarm Return air temperature sensor is shorted or open. Page 6
CSA CSA COIL TEMP SENSOR Coil Sensor Alarm Coil temperature sensor is shorted or open. Page 6
A1A A1A AUX1 SENSOR AU1 Temp Sensor Alarm AU1 temperature sensor is shorted or open. Page 6
A2A a2a AUX2 SENSOR AU2 Temp Sensor Alarm AU2 temperature sensor is shorted or open. Page 6
A3A a3a AUX3 SENSOR AU3 Temp Sensor Alarm AU3 temperature sensor is shorted or open. Page 6
Defrost
EdF EdF EXCESS DEFROST Excess Defrost Alarm Time between defrosts too short in demand defrost. Page 7
dtt dtt DEFR TERM ON TIME Defr Term on Time Alarm Defrost terminated on time instead of temperature for two
consecutive defrosts. Page 7
Superheat
HSH HSH HIGH SUPERHEAT High Superheat Alarm
[EEV] Superheat 2°F above superheat setpoint for 90 minutes of
cumulative runtime, and valve > 90% open.
[TEV] Superheat above SUPERHEAT setpoint for 90 minutes of
cumulative runtime.
Page 8-9
LSH LSH LOW SUPERHEAT Low Superheat Alarm Superheat below 3°F for 5 minutes and EEV < 10% open if EEV is
selected. Page 8-9
Temperature
HtA HtA HIGH AIR TEMP High Temperature Alarm Air temp above Room Temp + Air Temp Di + High Temp Alarm
Oset for longer than High Temp Alarm Delay. Page 10
LtA LtA LOW AIR TEMP Low Temperature Alarm Air temp below Room Temp - Low Temp Oset for longer than
Low Temp Alarm Delay. Page 10
Door Switch dor dor DOOR SWITCH Door Open Alarm Door open and air temp above Room Temp + 0.5°F longer than
Door Alarm Delay. Page 11
Communication
CoA CoA COMMUNICATION
ERROR Communication Error No communication between bonded controllers for one minute or more. Page 12
CLL CLL LEAD/LAG COMM
ERROR Lead Lag Comms Communication lost between lead/lag controllers. Page 12
CCA CCA COMP SEQ COMM
ERROR CompSeq. Comms Alarm Communication lost to KE2 Compressor Sequencer OEM. Page 12
EFL EFL EMAIL FAILURE Email Failure Alarm Email alert was not conrmed by email server provided after
seven consecutive attempts Page 12
NTP ntP TIMER SERVER COMM Time Server Comm Controller cannot communicate with external time of day server
(SNTP server). Page 12
Digital Inputs
EA1 EA1 EXTERNAL ALARM 1 External Alarm 1 Aux Input 1 is set to External Alarm and the input is active. Page 13
EA2 EA2 EXTERNAL ALARM 2 External Alarm 2 Aux Input 2 is set to External Alarm and the input is active. Page 13
EA3 EA3 EXTERNAL ALARM 3 External Alarm 3 Aux Input 3 is set to External Alarm and the input is active. Page 13

Q.1.61 January 2023
Page 3
KE2 EvapOEM
Alarm Troubleshooting Guide
© Copyright 2023 KE2 Therm Solutions, Inc., Washington, Missouri 63090
21214V3.0
Alarms & Notications List
Alarm Type Abbreviation Scrolling Text* Full Name Description Page
KE2 Combo
Display
dtS dtS DOOR TEMP SENSOR Door Temp Sensor Alarm Combo Display Aux 1 Door Temp Sensor is shorted or open. Page 13
dt2 dt2 DISPLAY AUX2 SENSOR Disp Aux2 Sensor Alarm Combo Display Aux 2 Temp Sensor is shorted or open. Page 13
dt3 dt3 DISPLAY AUX3 SENSOR Disp Aux3 Sensor Alarm Combo Display Aux 3 Temp Sensor is shorted of open. Page 13
dtH dtH DOOR TEMP HIGH High Door Temp Alarm Combo Door Temp above Door Temperature + High Door Alarm
Oset longer than High/Low Door Temperature Alarm Delay. Page 14
dtL dtL DOOR TEMP LOW Low Door Temp Alarm Combo Door Temp below Door Temperature - Low Door Alarm
Oset longer than High/Low Door Temperature Alarm Delay. Page 14
Hd2 Hd2 HIGH MONITOR TEMP2 High Mon2 Temp Alarm Combo Aux2 Monitor Temp reading above Monitor Temp2 High
Alarm setpoint longer than Monitor Temp2 Alarm Delay. Page 15
Ld2 Ld2 LOW MONITOR TEMP2 Low Mon2 Temp Alarm Combo Aux2 Monitor Temp reading below Monitor Temp2 Low
Alarm setpoint longer than Monitor Temp2 Alarm Delay. Page 15
Hd3 Hd3 HIGH MONITOR TEMP3 High Mon3 Temp Alarm Combo Aux3 Monitor Temp reading above Monitor Temp3 High
Alarm setpoint longer than Monitor Temp3 Alarm Delay. Page 15
Ld3 Ld3 LOW MONITOR TEMP3 Low Mon3 Temp Alarm Combo Aux3 Monitor Temp reading below Monitor Temp3 Low
Alarm setpoint longer than Monitor Temp3 Alarm Delay. Page 15
EA1 EA1 DISPLAY EXTERNAL
ALARM 1 Disp Ext1 Alarm Combo External Alarm 1 input is active. Page 15
EA2 EA2 DISPLAY EXTERNAL
ALARM 2 Disp Ext2 Alarm Combo External Alarm 2 input is active. Page 15
EA3 EA3 DISPLAY EXTERNAL
ALARM 3 Disp Ext3 Alarm Combo External Alarm 3 input is active. Page 15
Pbt Pbt HELP Panic Button Alarm KE2 Combo Display panic button is active. Page 15
LPCO (Low
Pressure Cut-Out
control) Only
Pdt Pdt PUMPDOWN TIMEOUT Pump Down Timeout Low Pressure Cut-out Time exceeded before suction pressure
reached Low Pressure Cut-out. Page 15
SCC SCC SHORT COMP CYCLE Short Compressor Cycle
Compressor started excessive number of times due to high
suctionpressure in o mode, or comp. stopped excessive number
of times due to low suction pressure while in refrigeration mode.
Page 15
LPA LPA LOW PRESSURE Low Pressure Alarm Suction pressure below Low Pressure Cut-out despite attempts
to run. Page 16
KE2 Humidity
Control
HSA HSA HUMIDITY SENSOR Humidity Sensor Alarm Humidity sensor is shorted or open. Page 16
HHA HHA HIGH HUMIDITY High Humidity Alarm
Humidity reading above Humidity Setpoint + Humidity
Dierential + Humidity Alarm Oset for longer than Humidity
Alarm Delay.
Page 16
LHA LHA LOW HUMIDITY Low Humidity Alarm
Humidity reading below Humidity Setpoint - Humidity
Dierential - Humidity Alarm Oset for longer than Humidity
Alarm Delay.
Page 17
CHA CHA HUMIDITY COMM Humidity Comms Alarm KE2 Evap OEM lost communication with KE2 Humidity Control
board for 10 seconds. Page 17
KE2 Evap OEM w/
High Side Control
Only
HDA HDA HIGH DISCH TEMP High Disch Temp Discharge temp reading above High Discharge Temp Setpoint for
longer than High Discharge Temp Delay. Page 17
LCT LCT SYSTEM LOCKOUT Comp Locked Out In one hour system cycled o on high discharge temp more times
than Max Number of Starts setpoint. Page 17
HCA HCA HIGHCOND TEMP High Cond Temp Condenser temp reading is above Cond Temp Setpoint + High
Cond Temp Alarm Oset for longer than High Cond Temp Delay. Page 18
LCA LCA LOW COND TEMP Low Cond Temp
Condenser temp reading is less than Cond Temp Setpoint - Low
Cond Temp Alarm Oset for longer than Low Cond Temp Alarm
Delay.
Page 18
A1A A1A AUX1 SENSOR Dis Aux1 Sensor Discharge temp sensor input is shorted or open. Page 18
A2A A2A AUX2 SENSOR Dis Aux2 Sensor Discharge temp sensor input is shorted or open. Page 18
A3A A3A AUX3 SENSOR Dis Aux3 Sensor Discharge temp sensor input is shorted or open. Page 18

KE2 EvapOEM
Alarm Troubleshooting Guide
Q.1.61 January 2023
Page 4
© Copyright 2023 KE2 Therm Solutions, Inc., Washington, Missouri 63090 21214V3.0
Troubleshooting Tables
Alarm & Alarm Name
Description Variables & Setpoints Corrective Action
Basic
Display Combo Display Web- pages
Blank Display No LEDs are
illuminated on the
display.
N/A Note: While not an alarm condition, the controller may or may not be operational if
nothing is shown on the Basic Display. The KE2 Evap OEM can continue to operate the
system even while the Basic Display is disconnected.
If controller is still powered and system is running troubleshoot the Basic Display:
• Make sure the plugs are fully inserted into the jacks at both the KE2 Evap OEM and the
Basic Display.
• Check the connection between the KE2 Evap OEM board and the Basic Display for any
burned, chaed, cut or otherwise damaged sections. If damaged, replace cable.
• There are two jacks on the Basic Display. Switch the jack used on the Basic Display and
check for functionality.
• Check to see if Basic Display cable is longer than 5ft. Maximum cable length between
Basic Display and KE2 Evap OEM board is 5ft.
If system is not running and there are no LEDs lit on the KE2 Evap OEM board,
check:
• Incoming voltage to the board. Voltage should be between 100VAC – 240VAC, if not
address supply voltage issue.
• Remove power to controller and check fuse located on board. The fuse cannot be
checked visually; remove fuse from board and check resistance across the fuse. An
open reading indicates the fuse has blown and points to a supply voltage issue or short
on the board or connected devices.The fuse will blow in order to protect the controller
from permanent damage. Check for proper incoming power, examine all cables for
burned, cut, chaed or otherwise damaged insulation/wire and repair. Replace fuse
(PN 21375).
• Remove all connections to controller except for power and the Basic Display; see if the
Basic Display illuminates.
Note: Power injected into the controller’s Ethernet port may result in the display going
blank and other unexpected problems.
Power over Ethernet (POE) switches connected to the KE2 Evap OEM should have the
power output feature disabled.
Ed
Ed ELECTRIC
DEFROST /
TEV
Intro “Ed” is blinking on the
Basic Display, yellow
and red LEDs are
ashing.
N/A Not an alarm condition, controller is in introduction mode. Please refer to Q.1.45 for
controller setup.
PrF
PrF N/A N/A Process Failure. Basic
Display is not com-
municating to the
controller.
N/A The Basic Display is not properly communicating with the KE2 Evap OEM board. The KE2
Evap OEM can continue to refrigerate without the Basic Display, but setpoints can only
be changed via the browser interface.
• Check that cable is inserted into the correct location on the board.
• Check that cable between board and display is rmly inserted at both ends.
• Check that cable is not cut, burned, chaed, disconnected or otherwise damaged.
• Cable should not be extended over 5ft.
• Conrm LEDs on KE2 Evap OEM board. The LEDs are located between the Ethernet
and display ports.
If PWR & BOOT are solid green, board is operating normally. There may be an issue
with the display, cable, or display port on the controller.
If RST is solid red, there is a hardware malfunction. Remove all connections to the
controller except for incoming power. If RST is still solid red, replace controller.
If BOOT & RST is blinking alternately, controller has been put in bootloader mode
to receive an update. If the update process has already started beyond putting the
controller in bootloader mode, complete the update to return to normal operation.
Otherwise, the controller will exit bootloader mode after 10 minutes.
NO NC
COM
TSuc (Suction Temp)
Aux3
Aux2
Aux1 (2nd Coil Temp)
TCoil (Coil Temp)
TAir (Return Air Temp)
0 to 10VDC Output
Alarm Relay**
Door Alarm Relay**
Variable Speed Fan
Ethernet Display
Defrost Relay
Liquid Line Solenoid/
Comp. Contactor Relay
Fan Relay
Blue
Orange
Yellow
Red
Black
Empty
Red
Green
White
Black
EEV
A
B
Shield
RS 485
Line/L1
Neutral/L2
Incoming Power
Red (+5 VDC)
Black (0 VDC)
Green (Signal)
Pressure Transducer
NO
COM
NC
NO
COM
Ground*
EARTH
Chassis
Ground*
Fuse
NO
COM (L2)
+
–
+
–
*Use only chassis
ground or spade
connector ground.
**Requires PN 21034 Solid State Relay (NO) or
PN 22005 Solid State Relay (NC) depending on
purpose. Additional wiring/relays may be required.
BOOT RST PWR
BL/BK
OR/BK
Y/BK
FAN/S
HEATERS
LL SOLENOID/COMP RELAY
BK/OR
L1
WT/R
L2
HS
GND
P/N 20996
12 AMP
20 AMP
3 AMP
OR NEUTRAL
HEATERS
thermsolutions
®
R/W
BL/BK
BK
BL/BK
FROM
CONTROLLER
EC MOTOR
RELAY
Supply Voltage
Fan
Motor
Fan
Motor
Fan
Motor
Evaporator
Fans
Heater Safety/High Limit Switch
Defrost Heaters
Liquid Line Solenoid
N.C.





2 4 68
1 0
1 0
2 4 68
3 7

Q.1.61 January 2023
Page 5
KE2 EvapOEM
Alarm Troubleshooting Guide
© Copyright 2023 KE2 Therm Solutions, Inc., Washington, Missouri 63090
21214V3.0
Troubleshooting Tables
Alarm & Alarm Name
Description Variables & Setpoints Corrective Action
Basic
Display Combo Display Web- pages
PSA
PSA PRESSURE
SENSOR Suc Pres
Sensor
Alarm
ONLY ACTIVE
WHEN AN ELECTRIC
EXPANSION VALVE IS
SELECTED.
Red LED is
illuminated.
Suction pressure
sensor is shorted,
open, or pressure is
out of range.
EEV cannot operate
while this alarm is
present.
Variables
PrS - Suction Pressure
Setpoints
rFG - Refrigerant
•Suction pressure will
read -14.6 if the green
input (signal) is open or
disconnected.
•Suction pressure will
read 150* or over if the
green input (signal)
is shorted, or if actual
pressure is higher than
the transducer is rated
for.
*150, 300, or 750
psig depending on
refrigerant selected.
The majority of sensor alarms and inaccurate readings are caused by cut, burned,
chaed or otherwise damaged sensor cables. Inspect the length of the cable for any
burned, chaed or otherwise damaged sections. Repair any damaged sections; take
care not to swap colors when repairing.
• Conrm that a KE2 Therm pressure transducer and cable are being used. KE2 Therm’s
pressure transducer cable will have red, black, and green leads.
• Check that the pressure transducer cable wires are inserted into the proper position
on the board (gray connector) and that the colors are inserted into the proper screw
down terminals. The bare stranded wire of the transducer cable should be inserted so
that the wire is directly touching the gate of the connector. If the gate is contacting the
insulation of the wire, it will not allow the controller to read the sensor.
• If wires have been extended, check that colors have not been swapped when extended.
Check for any bad splices, crimps or solder joints where extended.
• Check that the pressure transducer cable is fully inserted into the pressure transducer.
The cable should click when fully inserted into the transducer.
• Conrm that the proper transducer is being used for the system. 0-150psia for most
common refrigerants, 0-300psig for R-410A and 0-750psig for R-744 (CO2). Conrm
that the proper refrigerant (rFG) is selected in the setpoints menu.
• To verify the accuracy of the transducer, remove the transducer from the system. The
controller should read suction pressure as approximately 0 psig when measuring
atmosphere. The transducer can also be checked against your manifold set.
Note: If PrS shows -15 when transducer is measuring atmosphere, the wrong pressure
transducer/refrigerant combination has been selected.
• Verify the voltage between the black and red pressure transducer inputs on the
controller is +5 VDC.
• Measure the voltage between the black and green inputs on the controller. Enter that
number into the following formula:
(voltage read - 0.5V) x 150*psia = actual pressure read (verify with gauges)
4v
* 300 psig or 750 psig depending on pressure transducer range.

KE2 EvapOEM
Alarm Troubleshooting Guide
Q.1.61 January 2023
Page 6
© Copyright 2023 KE2 Therm Solutions, Inc., Washington, Missouri 63090 21214V3.0
Troubleshooting Tables
Alarm & Alarm Name
Description Variables & Setpoints Corrective Action
Basic
Display Combo Display Web- pages
SSA
SSA SUCTION
TEMP
SENSOR
T1 Suct
Sensor
Alarm
ONLY ACTIVE WHEN
AN ELECTRONIC
EXPANSION VALVE IS
SELECTED.
Red LED is illumi-
nated. System cannot
operate while this
alarm is present.
Temperature sensor is
shorted or open (not
connected).
Variables
SUt - T1 Suction Temp
rtP - Room (Air) Temp
CLt - Coil Temp
AU1 - Aux Temp 1
AU2 - Aux Temp 2
AU3 - Aux Temp 3
• If temp sensor reads
-88 the cable or sensor
is open, or not con-
nected.
• If temp sensor reads
180+ the input, cable,
or sensor is shorted.
•The majority of sensor alarms and inaccurate readings are caused by cut, burned,
chaed or otherwise damaged sensor cable. Inspect the length of the cable for any
cut, burned, chaed or otherwise damaged sections. Repair any damaged sections
•Check that the sensor is inserted into the proper position on the board. The sensor
is not polarized; black and white wires can be inserted in either position on the
connector:
Suction Temp: black connector labeled TSUC.
Air Temp: blue connector labeled TAIR.
Coil Temp: yellow connector labeled TCOIL.
2nd Coil Temp/Aux 1 Temp: green connector labeled AUX1.
Aux 2 Temp: black connector labeled AUX2.
Aux 3 Temp: black connector labeled AUX3.
•The bare stranded wire of the temperature sensor should be inserted so that the wire
is directly touching the gate of the connector. If the gate is contacting the insulation
of the wire, it will not allow the controller to read the sensor.
•If wires have been extended, check for any bad splices, crimps or solder joints where
extended.
•Check the sensor probe. If the sensor cable has been pulled, the sensor probe may
have been damaged, and needs to be replaced.
•To verify accuracy of the sensor, the preferred method is to place the sensor in a
proper ice bath while connected to the controller. View the relevant sensor in the
variables menu, temperature should read around 32.0°F. If adjustment is necessary,
an oset can be applied via the browser interface.
•Sensor accuracy can also be veried using a third party thermometer, however, it
must be calibrated and rated to measure low temperatures.
•Unplug the connector and check that the resistance reading of the sensor matches
the temperature vs. resistance table.
Temperature °F Ohms
-22 19480
-4 12110
14 7763
32 5114
50 3454
68 2387
77 2000
86 1684
104 1231
122 885
•If temperature appears to be within the proper operating range, swap a non-alarming
sensor with the sensor being diagnosed.
•If the new sensor is read properly by the controller, the sensor being diagnosed will
need to be replaced.
•If the sensor was disconnected for diagnostic purposes, return the sensor to the
appropriate location on the controller once diagnostics are complete.
ASA
ASA AIR TEMP
SENSOR
Air
Sensor
Alarm
Yellow LED is illumi-
nated. Controller will
attempt to continue
to operate system
while this alarm is
present.
Temperature sensor is
shorted or open (not
connected).
CSA
CSA COIL TEMP
SENSOR
T3 Coil
Sensor
Alarm
A1A
A1A AUX1
SENSOR
AUX1
Sensor
Alarm
A2A
A2A AUX2
SENSOR
AUX2
Sensor
Alarm
A3A
A3A AUX3
SENSOR
AUX3
Sensor
Alarm

Q.1.61 January 2023
Page 7
KE2 EvapOEM
Alarm Troubleshooting Guide
© Copyright 2023 KE2 Therm Solutions, Inc., Washington, Missouri 63090
21214V3.0
Troubleshooting Tables
Alarm & Alarm Name
Description Variables & Setpoints Corrective Action
Basic
Display Combo Display Web- pages
EdF EdF EXCESS
DEFROST
Excess
Defrost
Alarm
Yellow LED is illumi-
nated. Controller will
attempt to continue
to operate system
while this alarm is
present.
Time between
defrosts too short in
demand defrost.
Variables
CLt - Coil Temp
DEr - Defrost Relay
Setpoints
dtY - Defrost Type
ind - Initiate Defrost
Mode
dtP - Defrost Term Temp
Excess Defrost Alarm and Defrost Termination on Time Alarm are closely linked;
both indicate issues with the defrost process/defrost heat. Excess defrost alarm only
occurs when using defrost based on evaporator eciency (demand).
Air/ Electric / Hot Gas Defrost - Check solenoid valve. While the controller is in
refrigeration or satised on temperature, initiate a defrost from the Basic Display by
pressing and holding the and until ddF (defrost delay fan) or dEF appears.
The solenoid valve should close and the ow of liquid refrigerant to the evaporator
should be stopped for the entire defrost.
Note: For electric and hot gas defrost, the controller should run fans only for several
minutes while the system pumps down in ddF (defrost delay Fan) mode. In ddF,
solenoid valve and heaters should be o. The display will change to dEF (defrost) after
the fan operation is complete. Fans should turn o, solenoid valve should remain o,
and all heaters should turn on.
Electric Defrost - Verify that the heaters are working properly. Measure amperage of
the heaters while heaters are energized and check that it matches the nameplate of
the evaporator. If less than the nameplate, check for damaged heaters and any cut,
burned, chaed or disconnected wires in the heater circuit. Repair damage and check
for proper defrost operation.
Note: Toward the end of the defrost cycle, the controller periodically turns heaters o
to reduce steaming and overall heat of defrost.
Air/ Electric / Hot Gas Defrost - Verify coil sensor location. An excessive number
of defrosts is often due to coil sensor location. The coil sensor, or sensors, serve as
defrost termination sensors. If in an improper location (such as close to a heater), or
if a coil sensor has been pulled out, defrost will terminate too soon or will take too
long to terminate. The controller will respond by initiating another defrost shortly
after the irregular defrost, and the cycle will continue until the Excess Defrost Alarm
is triggered. Relocate the coil sensor to where frost has built up the heaviest on the
coil and initiate a defrost. Check to make sure the defrost terminates in a reasonable
amount of time (less than 30-35 minutes for air defrost, less than 18-22 minutes for
electric defrost) and the coil is completely clear of frost. If there is any frost remaining
on the coil after the defrost, relocate a coil sensor to that location. The proper location
for the coil sensor is always the last place frost disappears.
Air/ Electric / Hot Gas Defrost - Verify door has not been left open for an extended
period. Add door switch (PN 20543) to reduce excess frost caused by door openings.
Air/ Electric – Cold air from an evaporator in refrigeration in the same space may
prevent a defrosting coil from reaching termination temperature within a reasonable
amount of time. Bonding and synchronizing defrost on the evaporators allows the
evaporators to defrost more quickly. See Q.1.45-A Multi Evap Applications for more
information on bonding.
Air Defrost - The KE2 Evap OEM keeps the room temperature much tighter than is
typically seen in the industry. The KE2 Evap OEM’s default air temperature dierential
is 1.0°F, while the system is still protected from short cycling by minimum o and
minimum run times if temperature uctuation is larger than normal. If the room
temperature setpoint on the KE2 Evap OEM is set to the same temperature cut-out
as traditional mechanical controls where dierentials of 4.0°F or 5.0°F are common,
it will result in a much colder room temperature on average. Consider this when
setting the room temperature setpoint. If receiving Defrost Termination on Time or
Excess Defrost Alarm with air defrost, the room air heat alone may not be sucient to
complete the air defrost. The room temperature setpoint should be raised, or electric
heat added to the evaporator. Alternatively, dtP (defrost term temp) can be lowered
to one degree above rTP (room temp), however, the coil sensor MUST be in the spot
on the coil where frost disappears last during defrost to ensure a completely clean coil
after every defrost. Otherwise, set ind (initiate defrost mode) to SCH (schedule), and
set dPd (defrost per day) and dtL (defrost time length) to the number of times per
day and length of defrost needed to completely clear the coil of frost. If the maximum
defrost time is still not sucient to clear the coil of frost, the Defrost Termination on
Time Alarm will continue to trigger.
Return Defrost Mode to Demand after resolving the issue.
dtt dtt DEFR TERM
ON TIME
Defr
Term
on Time
Alarm
Yellow LED is illumi-
nated. Controller will
attempt to continue
to operate system
while this alarm is
present.
Defrost terminated
on time instead of
temperature for two
consecutive defrosts.

KE2 EvapOEM
Alarm Troubleshooting Guide
Q.1.61 January 2023
Page 8
© Copyright 2023 KE2 Therm Solutions, Inc., Washington, Missouri 63090 21214V3.0
Troubleshooting Tables
Alarm & Alarm Name
Description Variables & Setpoints Corrective Action
Basic
Display Combo Display Web- pages
HSH
HSH HIGH SU- PERHEAT
High Su-
perheat
Alarm
Yellow LED is
illuminated.
Controller will
attempt to continue
to operate system
while this alarm is
present.
[EEV] Superheat
reading 2°F above
superheat setpoint
for 90 minutes of
cumulative runtime,
and valve > 90%
open.
[TEV] Superheat
reading above
superheat setpoint
for 90 minutes of
cumulative runtime.
Variables
SHt - Superheat
PrS - Suction Pressure
SUt - Suction Temp
oPn - Valve % Open
Setpoints
rFG - Refrigerant
Edt - Expansion Device
Type
• Check the system suction pressure using either the Basic Display (PrS), or the con-
troller’s browser interface. Validate the suction pressure is within the range of the system
design. If a new install, conrm valve is properly sized for the system under all operating
conditions.
• Check refrigerant type. Press and hold until tS appears. Press to rFG (refriger-
ant). Press to see the currently selected refrigerant. To change refrigerant press
until the correct refrigerant is shown. Press and hold to save correct refrigerant
type. To exit the menu press .
• Check valve type. Press and hold until tS appears. Press to Edt (expansion de-
vice type). Press to see currently selected valve. To change the valve type press
until the correct valve is shown. Press and hold to save. Controller will reboot. Con-
rm proper system operation with the variables menu.
• If system operation has not improved, re-initialize the valve. This can be done by click-
ing the“Reboot”button on the Setpoints page under General Information in the brows-
er interface, or power may be cycled to the controller.
•Check the valve position in the variables menu (oPn). If the valve is fully open, verify
the valve is operating properly by manually operating the valve from the Basic Dis-
play. Press and at the same time on the Basic Display until a number with
the right most number blinking displays. This is the valve percent open, and the EEV
is now under manual control. Press to open and to close the valve. Press
momentarily to change how much the valve opens with each button press (0.1%, 1.0%
or 10.0%). The valve should start to move immediately to the position indicated on the
display. While verifying suction pressure either from the controller’s browser interface
or with gauges, begin closing the valve 10.0% at a time. The suction pressure should
decrease somewhat with each 10% closure. Completely close the valve to 0.0%; system
should pump down. If suction pressure responds to closing the valve, valve should be
operating correctly and a system issue is likely present: low charge, restriction in the
liquid line, dirty condenser etc. If suction pressure does not respond to manually oper-
ating the valve, proceed to next step.
LSH
LSH LOW SU- PERHEAT
Low Su-
perheat
Alarm
Yellow LED is
illuminated.
Controller will
attempt to continue
to operate system
while this alarm is
present.
Superheat reading
below 3°F for 5
minutes and EEV <
10% open if EEV is
selected.
Refrigerants
Abbreviation Full Name Abbreviation Full Name
R22 R-22 449 R-449A
134 R-134a 448 R-448A
42d R-422D 744 R-744
42A R-422A 410 R-410A
40C R-407C 407 R-407F
40A R-407A 409 R-409A
507 R-507 408 R-408A
404 R-404A 438 R-438A
458 R-458A 717 R-717
513 R-513A 452 R-452A
450 R-450A
Valve Types
Basic Display KE2 Combo Display
Description
Abbreviation Scrolling Text
tHr tHr MECHANICAL Thermostatic Expansion Valve (TEV).
PLS PLS PULSE VALVE Pulse Width Modulation (PWM) Valve.
rS rS KE2 RSV KE2 Therm’s Refrigeration Stepper Valve.
SEi SE
i
SER/SEI 1 TO 20 12VDC Bipolar Sporlan EEV with 1,600
max steps, 200 steps/second.
SEr SEr SER AA TO L 12VDC Bipolar Sporlan EEV with 2,500
max steps, 200 steps/second.
CrL CrL CAREL 12VDC Bipolar Carel EEV with 480 max
steps, 50 steps/second.

Q.1.61 January 2023
Page 9
KE2 EvapOEM
Alarm Troubleshooting Guide
© Copyright 2023 KE2 Therm Solutions, Inc., Washington, Missouri 63090
21214V3.0
Check wiring to the EEV terminal on the KE2 Evap OEM board. Refer below for prop-
er wiring of the KE2-RSV EEV and other common EEV wiring.
• The bare stranded wire of the EEV cable should be inserted so that the wire is
directly touching the gate of the connector. If the gate is contacting the insulation
of the wire, it will not allow the controller to correctly operate the valve.
• If wires have been extended, check that colors have not been swapped.
• Measure resistance across the EEV leads. This will measure the resistance for
the entire length of the lead wire, through the windings of the EEV and back to the
other lead.
All values should be within 10% of stated values, otherwise indicating a wir-
ing issue. If absolutely sure of no wiring issue, the external coil may need to be
replaced. For valves with internal windings, the valve may need to be replaced.
• If electrical diagnosis reveals no issues, and no system issues are present, there
may be debris in the valve port. The valve can be driven open/closed several times
through the manual control, while also lightly tapping the valve in an attempt
to dislodge any debris. If valve has a strainer, strainer may need to be cleaned.
Low Superheat Alarm Only
The Low Superheat Alarm is most commonly caused by the compressor failing to
start/ compressor not running. There is a common misconception in the industry
that the low pressure switch cut-in and cut-out pressure control on the condensing
unit is set correctly for the application from the factory.
The equipment manufacturers’ installation instructions recommend that the in-
stalling contractor adjust the low pressure cut-in and cut-out to recommended set-
tings for the application. The low pressure cut-in and cut-out set point should be
set to either the ambient or space temperature, whichever is lower.
When the controller calls for refrigeration, if suction pressure is not able to rise to
the cut-in pressure before the EEV closes due to low superheat, the system will not
start, and a Low Superheat Alarm triggered.
Our technical support team typically sees an increase of these alarms in the fall
when the ambient temperatures begins to decrease. If the low superheat alarm is
intermittent, this is the most likely source of the alarm. Check the following:
• Low Pressure Control Pressure Switch. Reduce the cut-out pressure to meet the
equipment manufacturer’s specication for the coldest ambient or box tempera-
ture, whichever is lower.
• Measure continuity across the low pressure control, if it indicates a closed cir-
cuit, next check the compressor start components and continue diagnosis at the
condensing unit.
• Verify all fans are moving. Check if there is a mechanical service switch for the
fans in the space being used inappropriately. If only one fan is not moving, verify
whether the fan is operational. Replace the motor if necessary.
• Check fan motor rotational direction and fan blade pitch to ensure air is ow-
ing in the proper direction.
• Check for diminished load due to low air movement across the coil. This can
be caused by excessive frost build-up on the coil on the air entering and/or air exit-
ing sides of the coil. The fans should be turned o while checking for frost buildup
to allow a clear view of the coil. Product that is stacked too close to the coil and
impedes airow through the coil can also be a source of diminished load.
• Check EEV and EEV wiring/cables – Please see previous steps.
MOTOR
BLUE
ORANGE
YELLOW
RED
BLACK
MOTOR
RED
GREEN
WHITE
BLACK
EEV
EMPTY
RSV
Check resistance across RSV leads:
Wire Colors RSV-100 to 320 RSV-400 to 550
Blue – Orange 36 or 46 ohms 32 ohms
Blue – Yellow 36 or 46 ohms 32 ohms
Blue – Red 36 or 46 ohms 32 ohms
Blue – Black 36 or 46 ohms 32 ohms
For Sporlan SER-AA to L, measure:
Wire Colors
Black – White 100 ohms
Red – Green 100 ohms
Black – Green Open
Red – White Open
HSH / LSH Corrective Action - Continued HSH / LSH Corrective Action - Continued

KE2 EvapOEM
Alarm Troubleshooting Guide
Q.1.61 January 2023
Page 10
© Copyright 2023 KE2 Therm Solutions, Inc., Washington, Missouri 63090 21214V3.0
Troubleshooting Tables
Alarm & Alarm Name
Description Variables & Setpoints Corrective Action
Basic
Display Combo Display Web- pages
HtA
HtA HIGH AIR
TEMP
High Air
Temp
Alarm
Yellow LED is
illuminated.
Controller will
attempt to continue
to operate system
while this alarm is
present.
Return air temp is
above Room Temp
setpoint + Air Temp
Di + High Temp
Alarm Oset for
longer than High
Temp Alarm Delay.
Example
Room Temp
setpoint 20°F
Air Temp
Di 1°F
High Temp
Alarm Oset 10°F
Alarm
threshold
temp
31°F
These setpoints can
be adjusted by the
user. The High Temp
Alarm Oset factory
default is 10.0°F for
electric defrost and
3.0°F for air defrost.
Variables
rtP - Room (Air) Temp
Setpoints
tS - Room Temp Set-
point
HAo - High Temp Alarm
Oset
HAd - High Temp Alarm
Delay
Investigate condition. The majority of high temperature alarms are not related to the
controller. To resolve the High Air Temp Alarm will require basic refrigeration trouble-
shooting.
• Ask sta if the door has been propped open for an extended period of time due to
loading, unloading, inventory, etc. If this is not the case, begin to troubleshoot the
system.
• Check air sensor.
• Check the evaporator coil to verify the coil is free from excessive frost.
• Check the fans to ensure all fans are rotating properly.
• Check compressor operation.
• Check for proper refrigerant charge.
• Make sure the system has sucient capacity.
• If pressure transducer and suction temperature sensor are installed, check superheat
and investigate if superheat is abnormally high.
• Troubleshoot TEV or EEV (if installed, see high superheat corrective actions on the
previous pages).
Note: High Temp Alarm is not triggered during defrost.
LtA
LtA
LOW AIR
TEMP
Low Air
Temp
Alarm
Yellow LED is
illuminated.
Controller will
attempt to continue
to operate system
while this alarm is
present.
Return air temp is
below Room Temp
setpoint - Low Temp
Alarm Oset for
longer than Low
Temp Alarm Delay.
The default alarm
condition is 4°F
below the Room
Temp setpoint for
10 minutes, but
can be adjusted as
necessary.
Variables
rtP - Room (Air) Temp
Setpoints
tS - Room Temp Set-
point
LAo - Low Temp Alarm
Oset
LAd - Low Temp Alarm
Delay
• Verify the system will pumpdown. This can be done in multiple ways; the easiest is
to initiate a defrost from the Basic Display. Press and hold the and until ddF
(defrost delay fan) or dEF (defrost) is displayed. Liquid line solenoid should close im-
mediately, if not, troubleshoot the solenoid and the wiring controlling the solenoid.
Solenoid should shut tightly and not allow liquid refrigerant through. If the system
only has an EEV, the EEV should also shut tightly during the defrost.
• Check that the low pressure control is set, and operating properly.
• Check the tS (room temperature setpoint), LAo (low alarm oset), and LAd (low
temp alarm delay) settings.
• If there are multiple systems in the room, check the room temperature setpoint of
the other systems.
• Check for outside air inltration. Example: Inltration from freezer into cooler.

Q.1.61 January 2023
Page 11
KE2 EvapOEM
Alarm Troubleshooting Guide
© Copyright 2023 KE2 Therm Solutions, Inc., Washington, Missouri 63090
21214V3.0
Troubleshooting Tables
Alarm & Alarm Name
Description Variables & Setpoints Corrective Action
Basic
Display Combo Display Web- pages
dor
dor
DOOR
SWITCH
Door
Open
Alarm
Yellow LED is illumi-
nated. Controller will
attempt to continue
to operate system
while this alarm is
present.
Door is open and air
temp reading above
Room Temp setpoint
+ 0.5°F longer than
Door Alarm Delay.
Variables
rtP - Room (Air) Temp
AU1 - Aux Input 1 Status
AU2 - Aux Input 2 Status
AU3 - Aux Input 3 Status
Setpoints
tS - Room Temp
setpoint
dAd - Door Alarm Delay
AU1 - Aux Input 1 Mode
A1A - Aux Input 1 State
AU2 - Aux Input 2 Mode
A2A - Aux Input 2 State
AU3 - Aux Input 3 Mode
A3A - Aux Input 3 State
KE2 Combo Display Setpoints
AUX1 FUNCTION
AUX1 SWITCH STATE
AUX2 FUNCTION
AUX2 SWITCH STATE
AUX3 FUNCTION
AUX3 SWITCH STATE
DOOR SWITCH STATE
•Verify that the door is closed.
•Verify which auxiliary input is being used for the door switch (AU1, AU2 or AU3).
Press and hold until tS appears. Press until AU1, AU2 or AU3 appears. Press
to view what the auxiliary input is currently set to. If the auxiliary input is set
to door switch, dor will be shown on the Basic Display. Press to return to the
advanced setpoints menu and check the other inputs. Verify the leads of the door
switch are connected to the correct auxiliary input, and that the bare stranded wire
of door switch lead is inserted so that the wire is directly touching the gate of the
connector. If the gate is contacting the insulation of the wire, it will not allow the
controller to read the door switch. Inspect the length of the cable for any cut, burned,
chaed or otherwise damaged wire. Repair if there is damage and verify operation.
• Verify that the door switch is in proper working order. Door switches provided
by KE2 Therm are normally closed switches. To test them, move the two pieces of the
switch close together, remove the leads from the connector on the board and check
that the circuit is continuous using a multimeter. Move the two pieces of the switch
apart more than 6 inches. Check continuity again; it should be open. If the door
switch is operating in an opposite manner, the switch is a normally open switch and
the controller should be recongured appropriately: select the correct input, A1A,
A2A or A3A (indicating Aux In 1, 2 or 3 state) and set it to CLo for activate on closed
circuit. If the switch is veried to be inoperable, replace the switch.
• Conrm proper door switch operation by opening the door, fans should turn o
and refrigeration should stop shortly after. Close door, the controller should resume
refrigeration and fans. If there is a blinking green light on the controller, it has not
cleared the time for short cycle protection and should resume refrigeration in a few
minutes.
• Check KE2 Combo Display inputs. If a KE2 Combo Display is present, additional
inputs are available for door switches. To conrm settings, press and hold and
at the same time for at least 3 seconds to access the KE2 Combo Display set-
points. Check AUX 1 FUNCTION, AUX 2 FUNCTION, AUX 3 FUNCTION, and DOOR
SWTCH STATE to see which input or inputs are set to DOOR SWITCH. Proceed with
the troubleshooting steps outlined above.

KE2 EvapOEM
Alarm Troubleshooting Guide
Q.1.61 January 2023
Page 12
© Copyright 2023 KE2 Therm Solutions, Inc., Washington, Missouri 63090 21214V3.0
Troubleshooting Tables
Alarm & Alarm Name
Description Variables & Setpoints Corrective Action
Basic
Display Combo Display Web- pages
CoA
CoA COMMU-
NICATION
ERROR
Network
Comms
Alarm
ONLY ACTIVE FOR
BONDED CONTROL-
LERS.
Yellow LED is illumi-
nated. Controller will
attempt to continue
to operate system
while this alarm is
present.
No communication
between controllers
for one minute or
more.
Variables
iP1 - IP Address Part 1
iP2 - IP Address Part 2
iP3 - IP Address Part 3
iP4 - IP Address Part 4
• Communication, Lead/Lag, and Compressor Sequencer Communications Alarms are
most commonly caused by local network issues.
• Verify all network switches are connected and functioning properly. Check that all
controllers in a bonded group, lead/lag pair, or compressor sequencer group are
powered up.
• Verify communication to each individual controller using whatever method is usually
used to communicate to the controllers in question (via IP address, KE2 SmartAccess
etc.). If one or more are unreachable, investigate those controllers and their network
cabling further.
• Ensure all cables are inserted fully into their respective jacks. Check for any damaged
cable.
• On new installations, where the cables are built in the eld, check network cables for
proper wire color code (Ethernet standard A or B, see Q.5.5 Making Ethernet Cable for
more information). Also make sure copper for each wire goes fully into the clip. If one
or more wires is out of order or doesn’t fully insert into the clip, it needs to be xed
before it can be used to communicate.
• Attempt to unbond and re-bond the controllers or unpair/re-pair for lead/lag (re-
member to re-enable Lead/Lag mode after re-pairing). If any of the controllers are
not discoverable from the Network page, investigate those controllers further.
CLL
CLL LEAD/LAG
COMM
ERROR
Lead/Lag
Comms
Alarm
ONLY ACTIVE FOR
LEAD/LAG CONTROL-
LERS.
Yellow LED is illumi-
nated. Controller will
attempt to continue
to operate system
while this alarm is
present.
Communication lost
between lead/lag
controllers.
CCA
CCA COMP SEQ
COMM
ERROR
CompSeq.
Comms
Alarm
ONLY ACTIVE WHEN
SITEVIEW IS ACTIVE.
Yellow LED is illumi-
nated. Controller will
attempt to continue
to operate system
while this alarm is
present.
Communication lost
to KE2 Compressor
Sequencer OEM.
EFL
EFL EMAIL
FAILURE
Email
Failure
Alarm
Yellow LED is illumi-
nated. Controller will
attempt to continue
to operate system
while this alarm is
present.
Email alert was not
conrmed by email
server provided after
seven consecutive
attempts.
Variables
iP1 - IP Address Part 1
iP2 - IP Address Part 2
iP3 - IP Address Part 3
iP4 - IP Address Part 4
Setpoints
dHC - DHCP mode
• Ensure the controller has Internet access. If possible plug a laptop into the Ethernet
cable at the controller to test Internet connection.
• Check the Network Info settings (gateway, DNS etc.) on the controller’s Network
webpage. If DHCP is enabled on the controller these settings should be provided
automatically to the controller by the local network.
• Email Failure Alarm is a function of the controller attempting to send out an email
alert using the information entered in the Alert Notications section of the Settings
Page, and failing to communicate successfully with the email server provided. If us-
ing a custom email server, consider using the KE2 Therm Default Server instead.
• Servers requiring basic authentication should provide User name and Password,
and ensure it is correctly entered.
• Servers without authentication requirements should not enter information in the
User name or Password eld. If unsure of server requirements and alarm occurs,
ensure both User name and Password are blank and retry.
• Check the Time Reference Options on the setpoints page of the controller webpage.
This is found under general information. If set to “Custom” ensure the web address
provided is a valid SNTP server. Alternatively, change the setting to “Internet”to use
a predened SNTP server or “Local” to rely on the local web browser to update the
time.
ntP
ntP TIMER
SERVER
COMM
Time
Server
Comm
Yellow LED is illumi-
nated. Controller will
attempt to continue
to operate system
while this alarm is
present.
Controller cannot
communicate with
external time of day
server (SNTP server).

Q.1.61 January 2023
Page 13
KE2 EvapOEM
Alarm Troubleshooting Guide
© Copyright 2023 KE2 Therm Solutions, Inc., Washington, Missouri 63090
21214V3.0
Troubleshooting Tables
Alarm & Alarm Name
Description Variables & Setpoints Corrective Action
Basic
Display Combo Display Web- pages
EA1
EA1 EXTERNAL
ALARM 1
EXT
ALARM 1
If AU1 (AUX IN 1
MODE) = EA1 (EXT
ALARM 1): The digital
input is in an active
state.
Variables
AU1 - Aux Input 1 Status
AU2 - Aux Input 2 Status
AU3 - Aux Input 3 Status
Setpoints
AU1 - Aux 1 Input Mode
A1A - Aux 1 Input State
AU2 - Aux 2 Input Mode
A2A - Aux 2 Input State
AU3 - Aux 3 Input Mode
A3A - Aux 3 Input State
• Troubleshoot the device connected to the auxiliary input to discover why it is in
alarm condition and resolve the issue.
• If the device is not in alarm, check to make sure the device is connected to the ap-
propriate position (AUX 1, AUX 2 or AUX 3).
• Review the KE2 Evap OEM settings to make sure they match the type of device
connected to the controller. AU1, AU2 or AU3 should be set to EA1, EA2 or EA3
respectively to set the aux input to be an external alarm.
• Verify the aux input state (A1A, A2A or A3A) is appropriately set to oPn (open) or
CLo (closed, reads continuity) to match the input’s functionality. If the controller
is displaying the opposite of what is expected, changing the state will reverse the
logic.
EA2
EA2 EXTERNAL
ALARM 2
EXT
ALARM 2
If AU2 (AUX IN 2
MODE) = EA2 (EXT
ALARM 2): The digital
input is in an active
state.
EA3
EA3 EXTERNAL
ALARM 3
EXT
ALARM 3
If AU3 (AUX IN 3
MODE) = EA3 (EXT
ALARM 3): The digital
input is in an active
state.
KE2 Combo Display Only
Alarm & Alarm Name
Description Variables & Setpoints Corrective Action
Basic
Display Combo Display Web- pages
dtS
dtS DOOR TEMP
SENSOR
Door
Temp
Sensor
Alarm
Combo Display Aux 1
Door Temp Sensor is
shorted or open.
Variables
DISP AUX1 STATUS
Setpoints
AUX1 FUNCTION
• The majority of sensor alarms and inaccurate readings are caused by cut, burned,
chaed or otherwise damaged sensor cable. Inspect the length of the cable for any
cut, burned, chaed or otherwise damaged sections. Repair any damaged sections.
• Check that the sensor is inserted into the proper position on the KE2 Combo Display
board. The sensor is not polarized; black and white wires can be inserted in either
position on the connector:
DOOR TEMP SENSOR: blue connector labeled TEMP1.
DISPLAY AUX2 SENSOR: blue connector labeled TEMP2.
DISPLAY AUX3 SENSOR: blue connector labeled TEMP3.
• If there is no sensor wired to the input, and none are expected to be wired in, the
input can be disabled. Press and hold and to display AUX1 FUNCTION
(press to navigate to AUX2 FUNCTION or AUX3 FUNCTION). Press to display
the current setpoint. Press or to select DISABLED. Press and hold to save.
• The bare stranded wire of the temperature sensor should be inserted so that the wire
is directly touching the gate of the connector. If the gate is contacting the insulation
of the wire, it will not allow the controller to read the sensor.
• If wires have been extended, check for any bad splices, crimps, or solder joints where
extended.
dt2
dt2 DISPLAY
AUX2 SEN-
SOR
Disp
Aux2
Sensor
Alarm
Combo Display Aux
2 Temp Sensor is
shorted or open.
Variables
DISP AUX2 STATUS
Setpoints
AUX2 FUNCTION
dt3
dt3 DISPLAY
AUX3 SEN-
SOR
Disp
Aux3
Sensor
Alarm
Combo Display Aux
3 Temp Sensor is
shorted of open.
Variables
DISP AUX3 STATUS
Setpoints
AUX3 FUNCTION

KE2 EvapOEM
Alarm Troubleshooting Guide
Q.1.61 January 2023
Page 14
© Copyright 2023 KE2 Therm Solutions, Inc., Washington, Missouri 63090 21214V3.0
Troubleshooting Tables
Alarm & Alarm Name
Description Variables & Setpoints Corrective Action
Basic
Display Combo Display Web- pages
dtH
dtH DOOR TEMP
HIGH
High
Door
Temp
Alarm
Yellow LED is illumi-
nated. Controller will
attempt to continue
to operate system
while this alarm is
present.
Combo door temp
reading above DOOR
TEMP setpoint + HI
DOOR ALR OFST for
longer than DOOR
TEMP ALR DLY.
Variables
DISP AUX1 STATUS
Setpoints
DOOR TEMP
HI DOOR ALR OFST
DOOR TEMP ALR DLY
• Check to see what the Door Temp variable is reading. If the reading seems abnor-
mally high or low, proceed to Door Temp Sensor alarm corrective actions.
• Conrm DOOR TEMP, HI/LO DOOR ALR OFST, and DOOR TEMP ALR DLY setpoints.
Press and hold and to access the KE2 Combo Display setpoints. Press
to navigate to DOOR TEMP. Press to see the current setpoint. If incorrect,
use the arrows to change the setpoint, then press and hold to save. Press
to navigate to HI DOOR ALR OFST and DOOR TEMP ALR DLY setpoint; repeat steps if
adjustment is required.
• Conrm where door temp sensor is landed on the controller. DOOR TEMP SENSOR
is the blue connector labeled TEMP1. If incorrect sensor is wired in, re-wire to correct
position.
• See if DISP HEATER RELAY in the VARIABLES menu is showing heater ON or OFF. If con-
troller is in High Door Temp Alarm and relay shows ON, or if controller is in Low Door
Temp Alarm and relay shows OFF, re-check setpoints and sensor reading. Otherwise,
continue with voltage checks below.
• Check to see if door mullion heater circuit has power. The door heater relay is on the
KE2 Combo Display board and labeled SSR-A and SSR-B. Measure each terminal to
ground, it should read correct voltage from each terminal to ground for the applica-
tion.
• After conrming voltage to ground, measure voltage across the SSR-A and SSR-B
terminals. A closed (energized) relay will indicate close to 0V. An open (de-energized)
relay will show the voltage potential between the two terminals. If opposite of what
is expected, controller must be replaced.
• Check walk-in manufacturer literature/support for additional troubleshooting.
dtL
dtL DOOR TEMP
LOW
Low
Door
Temp
Alarm
Yellow LED is illumi-
nated. Controller will
attempt to continue
to operate system
while this alarm is
present.
Combo door temp
reading below DOOR
TEMP - LO DOOR ALR
OFST for longer than
DOOR TEMP ALR DLY.
Variables
DISP AUX1 STATUS
Setpoints
DOOR TEMP
LO DOOR ALR OFST
DOOR TEMP ALR DLY
– KE2 Combo Display Only

Q.1.61 January 2023
Page 15
KE2 EvapOEM
Alarm Troubleshooting Guide
© Copyright 2023 KE2 Therm Solutions, Inc., Washington, Missouri 63090
21214V3.0
Troubleshooting Tables
Alarm & Alarm Name
Description Variables & Setpoints Corrective Action
Basic
Display Combo Display Web- pages
Hd2
Hd2 HIGH
MONITOR
TEMP2
High
Mon2
Temp
Alarm
Yellow LED is illumi-
nated. Controller will
attempt to continue
to operate system
while this alarm is
present.
Combo aux monitor
temp reading above
MON TMP HI ALRM or
below MON TMP LO
ALRM for longer than
MON TMP AL DLY.
Variables
DISP AUX2 STATUS
DISP AUX3 STATUS
Setpoints
MON TMP2 HI ALRM
MON TMP2 LO ALRM
MON TMP2 AL DLY
MON TMP3 HI ALRM
MON TMP3 LO ALRM
MON TMP3 AL DLY
• See if the refrigeration system is running, or in the case of a low alarm, whether the
refrigeration system is over-cooling due to a stuck thermostat, solenoid, EEV etc.
• Inltration from an adjoining freezer or outdoor wall may cause a low alarm. Ad-
dress the inltration and/or move the sensor to a more appropriate location.
• Ensure that the relevant Monitor Temp Alarm setpoint is high enough, and the
delay is long enough, so that the alarm does not trigger during normal loading or
defrost.
Ld2
Ld2 LOW
MONITOR
TEMP2
Low
Mon2
Temp
Alarm
Hd3
Hd3 HIGH
MONITOR
TEMP3
High
Monitor
Temp3
Alarm
Ld3
Ld3 LOW
MONITOR
TEMP3
Low
Monitor
Temp3
Alarm
EA1
EA1 DISPLAY
EXTERNAL
ALARM 1
Disp Ex1
Alarm
Yellow LED is illumi-
nated. Controller will
attempt to continue
to operate system
while this alarm is
present.
Combo External
Alarm input is active.
Variables
DISP AUX1 STATUS
DISP AUX2 STATUS
DISP AUX3 STATUS
Setpoints
AUX1 FUNCTION
AUX1 SWITCH STATE
AUX2 FUNCTION
AUX2 SWITCH STATE
AUX3 FUNCTION
AUX3 SWITCH STATE
• Troubleshoot the device connected to the Combo Display auxiliary input to dis-
cover why it is in alarm condition and resolve the issue.
• If the device is not in alarm, check to make sure the device is connected to the ap-
propriate position on the Combo Display board (TEMP1, TEMP2 or TEMP3).
• Review the Combo Display settings to make sure they match the type of device
connected to the controller. AUX1, AUX2, or AUX3 FUNCTION should be set to
EXTERNAL ALARM as appropriate to set the aux input to function as an external
alarm input.
• Verify the aux input state (AUX1, AUX2, or AUX3 SWITCH STATE) is appropriately set
to OPEN or CLOSED to match the input’s functionality. If the controller is alarming
when the external device is not active, changing the state will reverse the logic.
EA2
EA2 DISPLAY
EXTERNAL
ALARM 2
Disp Ext2
Alarm
EA3
EA3 DISPLAY
EXTERNAL
ALARM 3
Disp Ext3
Alarm
Pbt
Pbt HELP Panic
Button
Alarm
Red LED is illumi-
nated on KE2 Basic
Display. All LEDs
are blinking on KE2
Combo Display and
buzzer beeping.
Refrigeration will
stop while this alarm
is present.
• Check walk-in immediately for any trapped personnel.
• Press and hold Panic Button for 3 seconds to clear.
LPCO (Low Pressure Cut-Out control) Only
Pdt
Pdt PUMP-
DOWN
TIMEOUT
Pump
Down
Timeout
Low Pressure Cut-Out
Time exceeded be-
fore suction pressure
reached Low Pressure
Cut-out.
Variables
PrS – Suction Pressure
Setpoints
LPC – Low Pressure
Cut-out
LPt – Max Time for LPCO
• Check LPt to see if the Low Pressure Cut-out Time is too short.
• Check LPC to see if the Low Pressure Cut-out is set too low. LPC should be set to
refrigeration unit manufacturer’s recommendation.
• Conrm EEV is operating properly. See High/Low Superheat corrective actions for
troubleshooting the EEV.
• Follow compressor manufacturer’s troubleshooting guide to ensure compressor is
operating properly.
• If controller is operating a liquid line solenoid instead of compressor contactor, LPCO
control should not be enabled. Set LPt to 0 to disable LPCO control.
SCC
SCC
SHORT
COMP
CYCLE
Short
Com-
pressor
Cycle
Compressor started
excessive number of
times due to suction
pressure in o mode,
or compressor cut-
out excessive number
of times due to suc-
tion pressure while in
refrigeration mode.
Variables
PrS – Suction Pressure
Setpoints
LPC – Low Pressure
Cut-out
LPd – Pressure Dieren-
tial for LPCO
• Check LPC to see if the Low Pressure Cut-out is set too low. LPC should be set to
refrigeration unit manufacturer’s recommendation.
• Check LPd to see if the Pressure Dierential for LPCO is too small. LPd should be set
to refrigeration unit manufacturer’s recommendation.
• Conrm EEV is operating properly. See High/Low Superheat corrective actions for
troubleshooting the EEV.
• High superheat conditions can cause short cycling of the compressor while calling
for refrigeration. Troubleshoot the refrigeration system for common causes of high
superheat (restriction in the liquid line, ash gas, insucient subcooling, dirty con-
denser etc.).
• Conrm suction temperature is reading correctly. Follow Suction Temp Alarm cor-
rective actions.
• Conrm pressure transducer is reading correctly. Follow Pressure Sensor Alarm cor-
rective actions.
– KE2 Combo Display Only

KE2 EvapOEM
Alarm Troubleshooting Guide
Q.1.61 January 2023
Page 16
© Copyright 2023 KE2 Therm Solutions, Inc., Washington, Missouri 63090 21214V3.0
Troubleshooting Tables
Alarm & Alarm Name
Description Variables & Setpoints Corrective Action
Basic
Display Combo Display Web- pages
LPA
LPA LOW PRES-
SURE
Low
Pressure
Alarm
Suction pressure
below Low Pressure
Cut-out despite at-
tempts to run.
Variables
PrS – Suction Pressure
Setpoints
LPC – Low Pressure
Cut-out
• Check LPC to see if the Low Pressure Cut-out is set too high. LPC should be set to
refrigeration unit manufacturer’s recommendation.
• Check for restrictions in the liquid line.
• Conrm EEV is operating properly. See High/Low Superheat corrective actions for
troubleshooting the EEV.
KE2 Humidity Control Only
HSA
HSA HUMIDITY
SENSOR
Humidity
Sensor
Alarm
Yellow LED is illumi-
nated. Controller will
attempt to continue
to operate system
while this alarm is
present.
Humidity sensor is
shorted or open.
Variables
HU - Humidity
• The majority of sensor alarms and inaccurate readings are caused by cut, burned,
chaed, or otherwise damaged sensor cables. Inspect the length of the cable for any
burned, chaed, or otherwise damaged sections. Repair or replace any damaged sec-
tions; take care not to swap colors when repairing.
• Check that the humidity sensor cable wires are inserted into the proper terminals on
the KE2 Humidity Control, and that the screw down terminals are screwed down. The
bare stranded wire of the cable should be inserted so that the wire is directly touch-
ing the gate of the connector. If the gate is contacting the insulation of the wire, it will
not allow the controller to read the sensor.
• If wires have been extended, check that colors were not swapped when extended.
Check for any bad splices, crimps, or solder joints where extended.
• Verify the voltage between the red and black humidity sensor inputs on the control-
ler is approximately +14 VDC.
• Measure the voltage between the black and green inputs on the controller. Enter that
number into the following formula:
(voltage read / 5VDC) x 100 = humidity reading
HHA
HHA HIGH
HUMIDITY
High
Humidity
Alarm
Yellow LED is illumi-
nated. Controller will
attempt to continue
to operate system
while this alarm is
present.
Humidity reading
is above Humidity
Setpoint + Humidity
Dierential + Humid-
ity Alarm Oset for
longer than the Hu-
midity Alarm Delay.
Variables
HU – Humidity
Setpoints
HSP – Humidity Set-
point
HdP – Humidity Dif-
ferential
UAo – Humidity Alarm
Oset
UAd – Humidity Alarm
Delay
HEt – Heater setpoint
HEd – Heater Dieren-
tial setpoint
dto – Dehumidity Temp
Oset
USt – Max Superheat
• The humidity sensor should be located in an area representative of the controlled
space. Avoid large openings to the space as they have the potential to read higher
than the rest of the space. The senor must be placed with the metal cylinder in the
downward direction to read accurately.
• Conrm that any dehumidication, humidication, and/or reheat devices are operat-
ing as expected.
• Address any sources of inltration to reduce the amount of humidity being intro-
duced to the space.
• Check drain pan and drain line for any clogs.
• Conrm Electric Expansion Valve (EEV) and refrigeration system is operating as ex-
pected. See High/Low Superheat Alarm corrective actions for troubleshooting the
EEV.
• Increase the Max Superheat setpoint to increase runtime. Do not allow superheat at
the compressor to exceed the manufacturer’s recommended maximum.
• If system is satisfying on temperature before humidity target is reached, the Dehu-
midify Oset can be decreased. Do not allow room to over-cool to the point it dam-
ages product.
• If system is satisfying on temperature before humidity target is reached, additional
reheat or dehumidiers may be required. Defrost heaters should not be used for
reheat, as it does not allow the coil to reach dew point and extract moisture, leading
to higher humidity.
• For systems with electric defrost, increase the number of defrosts per day.
• If you believe the humidity reading may be in error, proceed to troubleshooting steps
for Humidity Sensor Alarm.
Humidity
Sensor
RED (+14VDC)
GREEN (SIG)
BLACK (0VDC)
GND
0-5
+12
EMPTY
– LPCO (Low Pressure Cut-Out control) Only

Q.1.61 January 2023
Page 17
KE2 EvapOEM
Alarm Troubleshooting Guide
© Copyright 2023 KE2 Therm Solutions, Inc., Washington, Missouri 63090
21214V3.0
Troubleshooting Tables
Alarm & Alarm Name
Description Variables & Setpoints Corrective Action
Basic
Display Combo Display Web- pages
LHA
LHA LOW
HUMIDITY
Low
Humidity
Alarm
Yellow LED is illumi-
nated. Controller will
attempt to continue
to operate system
while this alarm is
present.
Humidity reading is
below the Humidity
Setpoint - Humidity
Dierential - Humid-
ity Alarm Oset for
longer than the Hu-
midity Alarm Delay.
Variables
HU – Humidity
Setpoints
HSP – Humidity Set-
point
HdP – Humidity Dif-
ferential
UAo – Humidity Alarm
Oset
UAd – Humidity Alarm
Delay
Stt – (Min) Superheat
tS – Room Temp Set-
point
• The humidity sensor should be located in an area representative of the controlled
space. An area with poor air movement may provide an unusually low humidity read-
ing. The senor must be placed with the metal cylinder in the downward direction to
read accurately.
• Conrm that any dehumidication, humidication, and/or reheat devices are operat-
ing as expected.
• Conrm Electric Expansion Valve (EEV) and refrigeration system is operating as ex-
pected. See High/Low Superheat Alarm corrective actions for troubleshooting the
EEV.
• Decrease the Superheat setpoint to decrease runtime. Do not allow superheat at the
compressor to go below the manufacturer’s recommended minimum.
• For systems with electric defrost, decrease the number of defrosts per day or switch
to demand defrost. If number of defrosts is still high, see Excess Defrost corrective
actions.
• Review room temperature to see if room temp setpoint can be raised slightly. The
controller keeps a tighter temperature band than typical mechanical thermostats.
• If system is otherwise operating as expected, consider adding humidication to the
space.
• If you believe the humidity reading may be in error, proceed to troubleshooting steps
for Humidity Sensor Alarm.
CHA
CHA HUMIDITY
COMM
Humidity
Comms
Alarm
Yellow LED is illumi-
nated. Controller will
attempt to continue
to operate system
while this alarm is
present.
KE2 Evap OEM lost
communication with
KE2 Humidity Control
board for 10 seconds.
HU - Humidity Mode • Check to make sure the KE2 Humidity Control is powered up and both the KE2 Hu-
midity Control and KE2 Evap OEM have proper incoming voltage.
• Conrm the RS-485 connection between the KE2 Evap OEM and KE2 Humidity Con-
trol. The “A”terminal on the KE2 Evap OEM board should be wired to the “A”terminal
on the KE2 Humidity Control. The“B”terminal on the KE2 Evap OEM board should be
wired to the “B” terminal on the KE2 Humidity Control. GND/SH should not be con-
nected at either end.
• The bare stranded wire of the communication cable should be inserted so that the
wire is directly touching the gate of the connector. If the gate is contacting the insula-
tion of the wire, it will not allow communication.
• Check for any burned, cut, chaed sections of the communications cable, repair or
replace the cable or damaged sections.
• Switch the existing cable with Cat5e cable. Strip back the cable ends and use the
blue & blue with white stripe twisted pair for the A & B connections.
KE2 Evap OEM w/ High Side Control Only
HdA
HdA HIGH DISCH
TEMP
High
Disch
Temp
Red LED is illumi-
nated. System cannot
operate while this
alarm is present.
Discharge temp
reading above High
Discharge Temp
setpoint for longer
than High Discharge
Temp Delay.
Variables
AU1, AU2, AU3 – Dis-
charge Temp (any Aux
Input can be set to
Discharge Temp).
Setpoints
Hdd – High Discharge
Temp
HdL – High Discharge
Delay
• Conrm condenser fans are operating correctly.
• Clean condenser/remove any obstructions to proper airow.
• Conrm discharge sensor is reading properly.
• Conrm that Hdd and HdL setpoints are not set too low or short for the application.
Check manufacturer’s recommendations for maximum discharge temperature.
• Follow compressor/refrigeration unit manufacturer’s troubleshooting steps for high
discharge temperature.
LCT
LCT SYSTEM
LOCKOUT
Comp
Locked
Out
Red LED is illuminat-
ed. System cannot
operate while this
alarm is present.
In one hour system
cycled o on high
discharge temp more
times than Max Num-
ber of Starts setpoint.
Variables
AU1, AU2, AU3 – Dis-
charge Temp (any Aux
Input can be set to
Discharge Temp).
Setpoints
Hdd – High Discharge
Temp
HdL – High Discharge
Delay
NSt – Max Number of
Starts
• Proceed to corrective actions for High Disch Temp alarm.
• Must be manually cleared by clearing alarms or cycling power.
Troubleshooting Tables
Alarm & Alarm Name
Description Variables & Setpoints Corrective Action
Basic
Display Combo Display Web- pages
LHA
LHA LOW
HUMIDITY
Low
Humidity
Alarm
Yellow LED is illumi-
nated. Controller will
attempt to continue
to operate system
while this alarm is
present.
Humidity reading is
below the Humidity
Setpoint - Humidity
Dierential - Humid-
ity Alarm Oset for
longer than the Hu-
midity Alarm Delay.
Variables
HU – Humidity
Setpoints
HSP – Humidity Set-
point
HdP – Humidity Dif-
ferential
UAo – Humidity Alarm
Oset
UAd – Humidity Alarm
Delay
Stt – (Min) Superheat
tS – Room Temp Set-
point
• The humidity sensor should be located in an area representative of the controlled
space. An area with poor air movement may provide an unusually low humidity read-
ing. The senor must be placed with the metal cylinder in the downward direction to
read accurately.
• Conrm that any dehumidication, humidication, and/or reheat devices are operat-
ing as expected.
• Conrm Electric Expansion Valve (EEV) and refrigeration system is operating as ex-
pected. See High/Low Superheat Alarm corrective actions for troubleshooting the
EEV.
• Decrease the Superheat setpoint to decrease runtime. Do not allow superheat at the
compressor to go below the manufacturer’s recommended minimum.
• For systems with electric defrost, decrease the number of defrosts per day or switch
to demand defrost. If number of defrosts is still high, see Excess Defrost corrective
actions.
• Review room temperature to see if room temp setpoint can be raised slightly. The
controller keeps a tighter temperature band than typical mechanical thermostats.
• If system is otherwise operating as expected, consider adding humidication to the
space.
• If you believe the humidity reading may be in error, proceed to troubleshooting steps
for Humidity Sensor Alarm.
CHA
CHA HUMIDITY
COMM
Humidity
Comms
Alarm
Yellow LED is illumi-
nated. Controller will
attempt to continue
to operate system
while this alarm is
present.
KE2 Evap OEM lost
communication with
KE2 Humidity Control
board for 10 seconds.
HU - Humidity Mode • Check to make sure the KE2 Humidity Control is powered up and both the KE2 Hu-
midity Control and KE2 Evap OEM have proper incoming voltage.
• Conrm the RS-485 connection between the KE2 Evap OEM and KE2 Humidity Con-
trol. The “A”terminal on the KE2 Evap OEM board should be wired to the “A”terminal
on the KE2 Humidity Control. The“B”terminal on the KE2 Evap OEM board should be
wired to the “B” terminal on the KE2 Humidity Control. GND/SH should not be con-
nected at either end.
• The bare stranded wire of the communication cable should be inserted so that the
wire is directly touching the gate of the connector. If the gate is contacting the insula-
tion of the wire, it will not allow communication.
• Check for any burned, cut, chaed sections of the communications cable, repair or
replace the cable or damaged sections.
• Switch the existing cable with Cat5e cable. Strip back the cable ends and use the
blue & blue with white stripe twisted pair for the A & B connections.
KE2 Evap OEM w/ High Side Control Only
HdA
HdA HIGH DISCH
TEMP
High
Disch
Temp
Red LED is illumi-
nated. System cannot
operate while this
alarm is present.
Discharge temp
reading above High
Discharge Temp
setpoint for longer
than High Discharge
Temp Delay.
Variables
AU1, AU2, AU3 – Dis-
charge Temp (any Aux
Input can be set to
Discharge Temp).
Setpoints
Hdd – High Discharge
Temp
HdL – High Discharge
Delay
• Conrm condenser fans are operating correctly.
• Clean condenser/remove any obstructions to proper airow.
• Conrm discharge sensor is reading properly.
• Conrm that Hdd and HdL setpoints are not set too low or short for the application.
Check manufacturer’s recommendations for maximum discharge temperature.
• Follow compressor/refrigeration unit manufacturer’s troubleshooting steps for high
discharge temperature.
LCT
LCT SYSTEM
LOCKOUT
Comp
Locked
Out
Red LED is illuminat-
ed. System cannot
operate while this
alarm is present.
In one hour system
cycled o on high
discharge temp more
times than Max Num-
ber of Starts setpoint.
Variables
AU1, AU2, AU3 – Dis-
charge Temp (any Aux
Input can be set to
Discharge Temp).
Setpoints
Hdd – High Discharge
Temp
HdL – High Discharge
Delay
NSt – Max Number of
Starts
• Proceed to corrective actions for High Disch Temp alarm.
• Must be manually cleared by clearing alarms or cycling power.
– KE2 Humidity Control Only

KE2 EvapOEM
Alarm Troubleshooting Guide
Q.1.61 December 2022
Page 18
KE2 Therm Solutions
12 Chamber Drive . Washington, MO 63090
1.888.337.3358 . www.ke2therm.com
© Copyright 2023 KE2 Therm Solutions, Inc., Washington, Missouri 63090
Q.1.61 January 2023 supersedes all prior publications.
21214V3.0
Troubleshooting Tables
Alarm & Alarm Name
Description Variables & Setpoints Corrective Action
Basic
Display Combo Display Web- pages
HCA
HCA HIGH COND
TEMP
High
Cond
Temp
Yellow LED is illumi-
nated. Controller will
attempt to continue
to operate system
while this alarm is
present.
Condenser temp
reading is above
Cond Temp setpoint
+ High Cond Temp
Alarm Oset for lon-
ger than High Cond
Temp Delay.
Variables
AU1, AU2, AU3 – Con-
denser Temp (any Aux
Input can be set to
Cond Temp).
Setpoints
Cdt – Cond Temp
Setpoint
HCO – High Cond Temp
Oset
HCd – High Cond Alarm
Delay
• Conrm condenser fans are operating correctly.
• Clean condenser/remove any obstructions to proper airow.
• Conrm condenser temp sensor is reading properly.
• Conrm that Cdt, HCO, and HCd setpoints are not set too low or short for the ap-
plication.
LCA
LCA LOW COND
TEMP
Low
Cond
Temp
Yellow LED is illumi-
nated. Controller will
attempt to continue
to operate system
while this alarm is
present.
Condenser temp
reading is below
Cond Temp setpoint
- Low Cond Temp
Alarm Oset for lon-
ger than Low Cond
Temp Alarm Delay.
Variables
AU1, AU2, AU3 – Con-
denser Temp (any Aux
Input can be set to
Cond Temp).
Setpoints
Cdt – Cond Temp
Setpoint
LCO – Low Cond Temp
Oset
LCd – Low Cond Alarm
Delay
• Conrm condenser fans are operating correctly.
• Conrm condenser temp sensor is reading properly.
• Conrm that Cdt, LCO, and LCd setpoints are not set too high or short for the ap-
plication.
A1A
A1A AUX1 SEN-
SOR
Dis Aux1
Sensor
Discharge temp sen-
sor input is shorted
or open.
Variables
AU1, AU2, AU3 – Dis-
charge Temp (any Aux
Input can be set to
Discharge Temp).
• The majority of sensor alarms and inaccurate readings are caused by cut, burned,
chaed or otherwise damaged sensor cable. Inspect the length of the cable for any
cut, burned, chaed or otherwise damaged sections. Repair any damaged sections.
• Check that the sensor is inserted into the proper position on the KE2 Evap OEM
board. The sensor is not polarized; black and white wires can be inserted in either
position.
• The bare stranded wire of the temperature sensor should be inserted so that the wire
is directly touching the gate of the connector. If the gate is contacting the insulation
of the wire, it will not allow the controller to read the sensor.
• If wires have been extended, check for any bad splices, crimps, or solder joints where
extended.
A2A
A2A AUX2 SEN-
SOR
Dis Aux 2
Sensor
A3A
A3A AUX3 SEN-
SOR
Dis Aux3
Sensor
– KE2 Evap OEM w/ High Side Control Only