ClimateMaster Tranquility User manual

Residential Packaged
DIGITAL Geothermal
Heat Pumps
97B0601N01
Rev.: 01/15/14
Tranquility®Digital (DXM2)
Troubleshooting Guide
Table of Contents
Introduction 2
Troubleshooting Flow Chart 3-9
Flow Chart Reference Symbols and Diagrams 10
Contactor Chart 11
Verifying Pump Feedback Signal 11
Removing Powerhead on Modulating Valve 12-13
Checking Compressors 14-15
Reversing Valve Touch Test Chart 16
Performance Troubleshooting 17-18
Functional Troubleshooting 19-21
Commissioning Worksheet: 22-23
Typical Water Source Refrigeration Circuit 24
(Heating Cycle)
Basic Refrigeration Summary 25
Refrigeration Troubleshooting 26-27
Auxiliary Heat Check 28
Checking Pump Output 28
Compressor Contactor Voltage Check 29
Check CCH for 24 Volts 29
Verifying Contactor 29
Verifying Capacitor 30
Checking Pump Power Cord 30
Replacing Variable-Speed Pump Power Head31
Verifying Power at Molded Plug 31
for Compressor
Verifying Antifreeze 32
Second Stage Verification 33
Verifying 24V at Reversing Valve 34
Checking Reversing Valve at DXM2 34
A0-2 Jumper 35
Checking for Power at DXM2 35
Verifying DC Voltage on DXM2 Board 36
for Modulating Valve Check
TXV Bulb Test 37
Verifying Dipswitch Position 38
Replacing High Pressure Water Switch 38
Verifying a Thermistor 39-40
Turning Breaker on in Panel 41
or Aux Heat Control
Static Pressure Check 41
Locating Tstat Version and DXM2 Version 42
UltraCheck EZ™Motor Diagnostic Tool 42
Checking Dipswitches on DXM2 43
Magnet Test to Shift Reversing Valve 43
Checking Blower Line Voltage 44
Modulating Valve Loses Configuration 44
Hard Reset at Thermostat 45
Definitions of Conditions 46-47
DXM2 Board Layout and Dipswitches 48
DXM2 Controls 49-52
Wiring Diagrams 53-54
ATC Thermostat Screens and Set Up 55-61
Revision History 62

Troubleshooting Guide - Tranquility® Digital (DXM2) Packaged Units
Rev.: 01/15/14
2Geothermal Heat Pump Systems
Troubleshooting ClimateMaster Tranquility®Digital Packaged Heat Pumps is quite straightforward.
Most problems relate to water flow. Either there isn’t enough water flow or the entering water temperature is improperly
supplied. Most service problems can be addressed without refrigerant gauges. In fact, installing gauges on packaged heat
pumps can do more harm than good because packaged heat pumps contain less refrigerant compared to split systems.
The first thing to do is always perform a water side check (Heat of Extraction for Heating or Heat of Rejection for Cooling) to
determine if the unit is operating properly.
Set up and diagnostics are made easier using the communicating thermostat (ATC32) or the communicating service tool
(ACDU01). You must have ATC32 or ACDU01 to properly work on ClimateMaster Tranquility® Digital units that use the DXM2
control board.
Follow the flow chart on the following pages to help diagnose and solve your issue.
Introduction

3
Troubleshooting Guide - Tranquility® Digital (DXM2) Packaged Units
Rev.: 01/15/14
Troubleshooting Flow Chart
Did unit
start?
Check power
(208-240V)
Does thermostat say
‘No Communication’?
The unit did
start but it
locked out
Establish power
Check that the
compressor is not in a
thermal overload
Check Fault Code
from thermostat
or service tool
No No
Verify that
Dipswitch 1
on S3
is in ‘On’
position
Is there power
to DXM2 24V?
(18-31.5V)
A-W
A-W
A-Z
A-Z
No
Fault
See Fault Codes
and Possible
Causes
A-F
A-F
Check that there
are 24 volts at CC on
DXM2 board and a call
for heating or cooling
A-K
A-K
Check for 24V at
contactor
18-31.5 volts
A-M
A-M
No
Replace the
DXM2 Board
Check and possibly
replace wiring
No
No
Yes Yes
Next Page
Yes
Yes
No
A-A
A-A
Disconnect and
reconnect the
wires from the
DXM2. This
will reset the
thermostat.
Verify that
the DXM2’s
dipswitches are
set properly.
Is the unit properly
configured? See
Section 3.0 on
page 56.
B-G
B-G
If it is still not
communicating,
check the
thermostat wire
(Be sure it is
not running
along power
wire). Ensure all
wiring is landed
properly on
both DXM2 and
thermostat.
May need to hard
reset thermostat.
B-K
B-K

Troubleshooting Guide - Tranquility® Digital (DXM2) Packaged Units
Rev.: 01/15/14
4Geothermal Heat Pump Systems
See Section 3.2
on page 56.
Troubleshooting Flow Chart
My unit has
a Modulating
Valve. Is valve
opening?
Is the valve having
trouble shutting
completely and/or
is the unit
locking out?
No
Continued
Yes
Check
What are the ∆T set
points? Control defaults
are 7° heating and 10°
cooling. Open loop units
with EWT less than 50°
will need to lower ∆T to
4-5° in the heating mode.
Valve opens or
closes correctly
Yes
Verify A0-2
jumper is in
10V position.
A-V
A-V
Be sure unit
is configured
for Modulating
Valve.
Verify Valve and
powerhead
alignment
Manually open the valve 100%.
Remove powerhead from valve
with powerhead still energized.
Then verify that the notches on
valve body are in the correct
position.
Third notch aimed down in unit
position.
Then reattach powerhead.
A-C
A-C
Next Page
Replace pump
power head
No
Is there power
to the pump?
(208-240V)
A-O
A-O
The unit starts
but the pump
does not
Check that the
A0-2 jumper on
DXM2 board is in
PWM position
Yes
A-V
A-V
Yes
Replace
wire harness
Yes
No
A-P
A-P
Check DC Voltage
at DXM2 Board
A0-2-Ground = .5-10 VDC
Is voltage in this range?
Does the low
voltage wiring
have a broken
wire?
Check DC Voltage
at DXM2 Board
T1-Ground = 3-4 VDC
(Pump off)
0-2 VDC
(Pump on)
Is voltage in this range?
No
Replace
DXM2 board
A-J
A-J
Yes
No
Yes
Verify how the units are
configured in the thermostat
(refer to ‘Section 3.3 - Unit
Configuration’ on page 53).
Be sure unit is configured for
‘Variable Speed Pump Single’
if unit is on it’s own loop. If unit
shares a loop with other units,
then ensure that the unit is
configured for ‘Variable Speed
Pump Parallel.’

5
Troubleshooting Guide - Tranquility® Digital (DXM2) Packaged Units
Rev.: 01/15/14
No
Use Emerson EZ
Tool to troubleshoot
motor and verify
motor or module
Yes
Replace wire
harness
No
Continued
Troubleshooting Flow Chart
Verify in
configuration
that the unit
is configured
correctly for ECM
Yes Yes
Check the
communicating harness
from DXM2 to Module.
Is there a broken wire?
No
Is 208-240V at the
blower motor?
Check the wire
harness and
replace if needed
Replace
defective part
Next Page
Does blower
turn on?
Verify that
the wiring on
the valve and
DXM2 Board
are correct.
See wiring
diagrams on
pages 53-54.
Valve does
function but
when the unit
shuts off, the
valve remains
open.
Verify that the DC voltage on DXM2
between A0-2 and GND. Voltage should
be between 3.3-10VDC. This is the output
from the board to the valve.
Verify on 3/4” Valve Dipswitch
and 1” Valve Dial
A-X
A-X
A-C
A-C
Yes
B-F
B-F
B-I
B-I
The unit uses
a modulating
valve but the
thermostat
continues
to show a
variable-
speed pump.
Connect a piece of thermostat wire
between T1 and C on DXM2 so the
DXM2 board sees no feedback.
B-J
B-J

Troubleshooting Guide - Tranquility® Digital (DXM2) Packaged Units
Rev.: 01/15/14
6Geothermal Heat Pump Systems
Replace
defective
wiring
No
Verify that
Dipswitch
1:4 is on
No
Call for
cooling
Unit starts but
does not shift
to cooling
Continued
Verify that
you have
cooling
call at
thermostat
No
Yes
Check
reversing valve
connection at
DXM2. Do you
have 24 volts?
Yes
A-U
A-U
Verify
24V at
reversing
valve
Yes Replace
solenoid on
reversing valve
Yes
In order to increase pressure
and move a reversing valve
that is sticking, place unit in
heating mode and then remove
blower door. After a few
minutes, energize the valve. If
it still doesn’t shift, try a strong
magnet to pull over internal
slide while energizing.
A-T
A-T
B-H
B-H Verify RV
operation
Replace the reversing valve if
it still does not shift
Next Page
Replace
board
A-E
A-E
Troubleshooting Flow Chart
There are
no faults,
but does the
compressor
start?
Verify comp contactor.
Verify capacitor. Turn off
power and allow 5 minutes
for discharge. Then verify
with volt meter the UF
reading compare to UF
reading on capacitor. Is
capacitor good?
No
A-N
A-N
Replace capacitor.
No
Yes Verify power to
compressor at
molded plug
Replace molded
plug and wire
harness
A-Q
A-Q
Turn power off and
remove molded plug on
compressor. Measure
resistance between C-S
and C-R.
Replace compressor
A-D
A-D
Yes
A-A
A-A
Yes
No
Yes
Yes
Is the
blower loud?
Check your
model’s airflow
configuration.
See Section 3.1
on page 56.
Check static
pressure
B-D
B-D
No
Verify that
all grilles
and registers
are open.

7
Troubleshooting Guide - Tranquility® Digital (DXM2) Packaged Units
Rev.: 01/15/14
Verify whether
the thermostat
is configured
for multi-stage
operation
No
Unit does not
seem to be
in the second
stage. This is
indicated by the
performance
check being
about 30% off
(low).
Verify that
you have
second
stage call
Does
DXM2
CCH have
24V?
Verify that
Dipswitch
1:4 is on
No
A-L
A-L
Yes Yes Yes
Does the rectifier
plug on the side
of the compressor
(15-27 VDC) have
24 volts?
Replace the
rectifier plug
No
For amp draw, check
with unit running and
then check amp draw
of comp. Next, remove
rectifier plug. Amps
should be lower after
you remove plug. After
you reattach plug, amps
should go back up.
Yes
A-S
A-S
Replace
compressor
No
Continued
The unit started
but runs and
loop temp keep
dropping in the
heating mode
Yes
Verify the antifreeze
level where applicable.
Remember that EWT
below 45° needs 15°
freeze protection.
Verify with appropriate
hydrometer.
A-R
A-R
Yes
Antifreeze has
been verified
as having
15° freeze
protection.
Then cut the
JW3 jumper
Yes
Is there enough loop in
the ground? Is the loop
making good contact?
(Example: Is your
vertical loop grouted
from top to bottom?)
Is the loop turbulent?
Min 2500 Reynolds
Number.
Yes
Next Page
Replace
board
Use Pressure Drop
Software to verify
Troubleshooting Flow Chart
No
No

Troubleshooting Guide - Tranquility® Digital (DXM2) Packaged Units
Rev.: 01/15/14
8Geothermal Heat Pump Systems
Continued
Configure
No
See Lockout
Faults on page
51 under ‘Fault
Codes’
Is there more
than one unit
sharing a
common loop?
No
Properly configure
unit. See Section 3.3
and Section 3.4 on
page 57.
Does this unit
have a Variable
Speed Pump and
is it configured for
parallel pumping?
No
Yes Yes Yes
Is the thermostat
configured for the proper
model of the unit?
(Example: TZ036) This is
found on thermostat’s unit
configuration menu.
Yes Yes
Does the unit have the
correct ECM Motor? Check
the ECM table, which is in
the unit’s IOM.Compare to
the motor in the unit.
Verify pump is
supplying enough flow
using Pressure Drop
Software. Closed loop
2.25 - 3.0 gpm per ton.
Replace with
correct motor
No
The unit
periodically
locks out on LT1
in heating or
high pressure in
cooling
ATC Thermostat
says ‘ECM
Configuration
Error’
The unit does
run but ATC
Thermostat
says ‘Service
Needed’
Yes
Troubleshooting Flow Chart
This is the Unit
Performance Sentinel
causes in cooling mode
if LT2 is less than 40° or
LT1 is 125° or greater. In
heating mode if LT2 is 125°
or greater.
Go to Faults
Code 8.
A-F
A-F
Next Page
No
No
No

9
Troubleshooting Guide - Tranquility® Digital (DXM2) Packaged Units
Rev.: 01/15/14
Replace
DXM2
No
Unit runs but
does not satisfy
Yes Yes
The unit is running.
However, there is
a load issue. The
home is losing or
gaining more than
the capacity of the
heat pump.
If water flow and airflow are
good, then verify refrigerant
charge. Calculate superheat and
subcooling.
A-H
A-H
Troubleshooting Flow Chart
Continued
The unit runs
but auxiliary
heat is not
working
Yes Is the thermostat
calling for
auxiliary heat or
emergency heat?
Verify that
configuration is set
to auxiliary heat in
thermostat. See
section 2.2.2 on
page 55.
No
Does unit have
208-240V at
auxiliary heat
strip?
Turn breaker
on in panel or
in auxiliary heat
control
B-C
B-C
No
Does DXM2
have 24 VDC
at EH1 and/or
EH2?
Yes Yes
A-I
A-I
Replace
wire harness
No
Does the heat
strip control
board have the
same 24 VDC as
the DXM2?
Yes
Replace heat
strap board
Yes
Verify the Water Side
Performance
HE = Heat Extraction in
BTUs (Heating)
HR = Heat Rejection in
BTUs (Cooling)
Calculate using the formula
found on A-G.
Check with performance
data. Is unit within 10%?
A-G
A-G
Verify load using a
manual J program.
You may also need to
perform a blower door
test for true infiltration
and thermal imaging
for locating heat loss.
Also consider a duct
blast to verify that
air is being delivered
properly.
Yes
Adjust charge if needed to proper
superheat and subcooling ranges.
No
Then
No

Troubleshooting Guide - Tranquility® Digital (DXM2) Packaged Units
Rev.: 01/15/14
10 Geothermal Heat Pump Systems
Reference Symbols and Diagrams
for Flow Chart

11
Troubleshooting Guide - Tranquility® Digital (DXM2) Packaged Units
Rev.: 01/15/14
Verifying Pump Feedback Signal
Contactor Chart
A-A
A-A
Contactor
closed
Motor does
not hum
Burned
contacts Open in low voltage circuit Incorrect wiring Open motor wiring Open overload switch
Motor hums, cuts off
on overload circuit
breaker or blows
fuses
Compressor tight or
stuck High discharge
pressure not
equalized
Low line
voltage Burnt out or open winding Non-condensibles in
refrigerant circuit
Compressor open
Buzzing
Check
contactor
Normal voltage
to coil
Contactor defective,
jammed or hung up
Low voltage
to coil
Wrong gauge of
thermostat wire Low voltage from
transformer
Not buzzing
Loose
wire No voltage to coil
No power
to control circuit
Voltage
to coil
Coil open
circuited
A-B
A-B
Alarm
Relay
Off On
A
OVR
ESD
C
Acc1
Relay
Acc2
Relay
H
COM
NC1
NO1
COM
NC2
NO2
P3
Status
Fault
R R
S1
S2
Factory Use
U1
Off
COH
COM
AO2
P11
Gnd T1 T2 T2 T3
A0-1 A0-
Off On
S3
1 2 3 4
1 2 3 4 5 6 7 8
0-2 VDC with pump on
3-4 VDC with pump off
Ensure that correct wiring has landed on T1
Yellow, A02 White. If not, voltage may look good
but pump may not operate.

Troubleshooting Guide - Tranquility® Digital (DXM2) Packaged Units
Rev.: 01/15/14
12 Geothermal Heat Pump Systems
Removing Powerhead on ¾-Inch Modulating Valve
A-C
A-C
On 3/4” valve, be sure that dip switch
is moved up or toward center of
valve and valve closes.
For Proper Valve-to-Head Alignment
Before removing power head, go
to manual mode and open valve to
100%. Stay on that screen and with
the valve powered open, remove
power head. Verify or rotate physical
valve to the position.
Open
Closed

13
Troubleshooting Guide - Tranquility® Digital (DXM2) Packaged Units
Rev.: 01/15/14
Removing Powerhead on 1-Inch Modulating Valve
A-C
A-C
2) The 1-inch valve includes
a tool to remove the
power head.
See previous page for
proper valve-to-head
alignment.
Open
Closed
1) Rotate dial to ‘1’ on the
1-Inch valve.

Troubleshooting Guide - Tranquility® Digital (DXM2) Packaged Units
Rev.: 01/15/14
14 Geothermal Heat Pump Systems
Checking Compressors
A-D
A-D
Compressor C-S
Ohms
C-R
Ohms Unit
ZPS20 1.64 1.30 TZ024, TE026
ZPS30 1.52 0.88 TZ036, TE038
ZPS40 1.86 0.52 TZ048, TE049
ZPS51 1.68 0.41 TZ060, TE064
ZPS60 1.85 0.34 TE072
ZPS26 1.90 1.02 TZ030
ZPS35 1.55 0.62 TZ042
Note: Readings are good ± 7%
Note: Reading S-R = C-S + C-R Readings
Example: ZPS20 S-R = 2.94 Ohms
Compressor Ohms Table
Overload opens
R
S
C
Compressor with Open Internal Overload
If both R and S are open to
common, Internal overload
is open.
R
S
C
Open run winding (infinite)
resistance. Start winding shows
measurable resistance.
R
S
C
Note: If not, O resistance will
be close to it.
C-S and C-R will have high
resistance above 3 ohms.
Suction
Line
R
S
C
Check for ground by placing
one lead on suction line.
Compressor with Open Run Winding
Compressor with Shorted Windings Compressor Winding Shorted to Ground

15
Troubleshooting Guide - Tranquility® Digital (DXM2) Packaged Units
Rev.: 01/15/14
An Alternative Way of Checking Compressors
A-D
A-D
Application - Hermetic Motors
Hermetic motors require special test parameters since the
winding operates in an oil and refrigerant atmosphere.
Under normal conditions the oil and refrigerant have a high
electrical resistance. However, when they are contaminated
with moisture, the electrical resistance changes and a low
megohm reading of the winding terminal to ground may
actually be the resistance of the contaminants in the oil and
not in the winding insulation.
New hermetic motors have a resistance value of more than
100 megohms. Readings of 50 megohms or less would
indicate that either the winding insulation is deteriorating or
the oil/refrigerant is contaminated.
Installing an oversized drier may clean up the system or
another possible solution could be replacing all of the
compressor oil. In either case, if the megohm tests show
even the slightest improvement in resistance values, the
remedy may have checked a declining condition.
A good “rule of thumb” is to smell a small sample of the oil. If
at any time in the history of the unit the motor was severely
overloaded, it will leave a tell tale trace in the oil than can
be removed other than by discharging all the refrigerant and
replacing the oil.
The odor of burnt insulation is easily recognizable and a low
resistance value of 20 megohms or less will verify that the
motor insulation may be severely damaged.
Megohmmeter

Troubleshooting Guide - Tranquility® Digital (DXM2) Packaged Units
Rev.: 01/15/14
16 Geothermal Heat Pump Systems
Reversing Valve Touch Test Chart
4
2
3
1
65
Line to
Air Coil
Discharge from
Compressor
Line to
Coax
Suction Line
to Compressor
A-E
A-E
VALVE
OPERATING
CONDITION
NOTES: * Temperature of Valve Body
** Warmer than Valve Body
1234 5 6
NORMAL OPERATION OF VALVE
Normal
COOLING Hot Cool Cool 23 (2)
Hot
23 (7) TVB *TVB
Normal
HEATING Hot Cool Hot 23 (1)
Cool
23 (2) TVB *TVB
MALFUNCTION OF VALVE Possible causes Corrections
Valve will not
shift from heat
to cool
Check electrical circuit and coil
No Voltage to coil Repair electrical circuit
Defective coil (No resistance) Replace coil
Check refrigeration charge
Low charge Repair leak, recharge system
Pressure differential too high Recheck system
Hot Cool Hot
23 (1)
Cool
23 (2) Hot *TVB
Pilot valve okay. Dirt in one bleeder hose. Deenergize solenoid, raise head pressure and reenergize
solenoid to break dirt loose. If unsuccessful, remove
valve and clean out. Check on air before installing if not
movement, reduce valve, add strainer to decharge tube and
mount valve horizontally
Platon cup leak Stop unit. After pressure equalizes, restart with solenoid
energized. If valve shifts, restart with compressor running. If
still no shift, replace valve.
Hot Cool Hot
23 (1)
Cool
23 (2) Hot *TVB Clogged pipe tubes. Raise head pressure, operate solenoid to free. If still no shift,
replace valve
Hot Cool Hot
23 (1)
Cool
23 (2) Hot Hot Both parts of pilot open. (Back seat port did not
close)
Raise head pressure, operate solenoid to free partially
clogged port. If still no shift, replace valve.
Warm Cool Warm
23 (1)
Cool
23 (2) Warm TVB Defective compressor
Start to shift
but does not
complete
reversal
Hot Warm Warm Hot *TVB Hot
Not enough pressure differential at start of
stroke or not enough flow to maintain pressure
differential.
Check unit for correct operating pressures and charge.
Raise head pressure. If no shift, use valve with smaller ports.
Body damage. Replace valves.
Hot Warm Warm Hot Hot Hot Both parts of pilot open. Raise head pressure, operate solenoid. If no shift, replace
valve.
Hot Hot Hot Hot *TVB Hot
Body damage. Replace valve.
Valve hung up at mid-stroke. Pumping volume of
compressor not sufficient to maintain reversal.
Raise head pressure, operate solenoid. If no shift, use valve
with smaller ports.
Hot Hot Hot Hot Hot Hot Both parts of pilot open. Raise head pressure. Operate solenoid. If no shift, replace
valve.
Apparent lock
in cooling
Hot Cool Cool
23 (2)
Hot
23 (1) **WVB *TVB Pilot needle on end of side leaking. Operate valve several times then recheck. If excessive leak,
replace valve.
Hot Cool Cool
23 (2)
Hot
23 (1) **WVB **WVB Pilot needle and piston needle leaking Operate valve several times then recheck. If excessive leak,
replace valve.
Will not shift
cool to heat
Hot Cool Cool
23 (2)
Hot
23 (1) TVB TVB
Pressure differential too high Stop unit. Will reverse during equalization period. Recheck
system.
Clogged pilot tube Raise head pressure. Operate solenoid to free dirt. If still no
shift, replace valve.
Hot Cool Cool
23 (2)
Hot
23 (1) TVB Hot
Dirt in bleeder hole Raise head pressure. Operate solenoid. Replace valve.
Piston cup leak
Stop unit. After pressures equalize, restart with solenoid
deenergized. If valve shifts, reattempt with compressor
running. If it still will not reverse while running, replace valve.
Hot Cool Cool
23 (2)
Hot
25 (1) Hot Hot Defective pilot. Replace valve.
Warm Cool Cool
23 (2)
Warm
25 (1) *TVB Warm Defective compressor.

17
Troubleshooting Guide - Tranquility® Digital (DXM2) Packaged Units
Rev.: 01/15/14
Symptom Htg Clg Possible Cause Solution
0UZ\MÄJPLU[*HWHJP[`
Not Cooling
or Heating Properly
XX+PY[`ÄS[LY 9LWSHJLVYJSLHU
9K\JLKVYUVHPYÅV^ *OLJRMVYKPY[`HPYÄS[LYHUKJSLHUVYYLWSHJL
PUOLH[PUN *OLJRMHUTV[VYVWLYH[PVUHUKHPYÅV^YLZ[YPJ[PVUZ
TVVOPNOVML_[LYUHSZ[H[PJJOLJRZ[H[PJ]ZISV^LY[HISL
9LK\JLKVYUVHPYÅV^ *OLJRMVYKPY[`HPYÄS[LYHUKJSLHUVYYLWSHJL
PUJVVSPUN *OLJRMHUTV[VYVWLYH[PVUHUKHPYÅV^YLZ[YPJ[PVUZ
TVVOPNOVML_[LYUHSZ[H[PJJOLJRZ[H[PJ]ZISV^LY[HISL
:LL)+
XX3LHR`K\J[^VYR
*OLJRZ\WWS`HUKYL[\YUHPY[LTWLYH[\YLZH[[OL\UP[HUKH[
KPZ[HU[K\J[YLNPZ[LYZPMZPNUPÄJHU[S`KPMMLYLU[K\J[SLHRZ
HYLWYLZLU[/H]LHK\J[ISHZ[[LZ[WLYMVYTLK
XX3V^YLMYPNLYHU[JOHYNL *OLJRZ\WLYOLH[HUKZ\IJVVSPUNWLYJOHY[
XX9LZ[YPJ[LKTL[LYPUNKL]PJL *OLJRZ\WLYOLH[HUKZ\IJVVSPUNWLYJOHY[YLWSHJLPM
YLZ[YPJ[PVU)V[O:/HUK:*^PSSILOPNO
X+LMLJ[P]LYL]LYZPUN ]H S]L 7LYMVYT9=[V\JO[LZ[
XX;OLYTVZ[H[PTWYVWLYS`SVJH[LK *OLJRSVJH[PVUHUKMVYHPYKYHM[ZILOPUKZ[H[
XX<UP[\UKLYZPaLK 9LJOLJRSVHKZZPaPUNJOLJRZLUZPISLJSNSVHKHUKOLH[
W\TWJHWHJP[`
XX:JHSPUNPU^H[LYOLH[L_JOHUNLY 7LYMVYT:JHSPUNJOLJRHUKJSLHUPMULJLZZHY`
XX0USL[^H[LY[VVOV[VYJVSK *OLJRSVHKSVVWZPaPUNSVVWIHJRÄSSNYV\UKTVPZ[\YL
High Head
Pressure
X9LK\JLKVYUVHPYÅV^
*OLJRMVYKPY[`HPYÄS[LYHUKJSLHUVYYLWSHJL
PUOLH[PUN
*OLJRMHUTV[VYVWLYH[PVUHUKHPYÅV^YLZ[YPJ[PVUZ
TVVOPNOVML_[LYUHSZ[H[PJJOLJRZ[H[PJ]ZISV^LY[HISL
:LL)+
X9LK\JLKVYUV^H[LYÅV^ *OLJRW\TWVWLYH[PVUVY]HS]LVWLYH[PVUZL[[PUN
PUJVVSPUN *OLJR^H[LYÅV^HKQ\Z[[VWYVWLYÅV^YH[L
X0USL[^ H[LY[VVOV[ *OLJRSVHKSVVWZPaPUNSVVWIHJRÄSSNYV\UKTVPZ[\YL
X(PY[LTWLYH[\YLV\[VMYHUNLPU
OLH[PUN )YPUNYL[\YUHPY[LTW^P[OPUKLZPNUWHYHTL[LYZ
X:JHSPUNPU^H[LYOLH[L_JOHUNLY 7LYMVYT:JHSPUNJOLJRHUKJSLHUPMULJLZZHY`
XX<UP[V]LY JOHYNLK *OLJRZ\WLYOLH[HUKZ\IJVVSPUNYL^LPNOPUJOHYNL
XX5VUJVUKLUZHISLZPUZ`Z[LT VHJ\\TZ`Z[LTHUKYL^LPNOPUJOHYNL=HJ\\T[VTPU
TPJYVUZ
XX9LZ[YPJ[LKTL[LYPUNKL]PJL *OLJRZ\WLYOLH[HUKZ\IJVVSPUNWLYJOHY[YLWSHJL
3V^:\J[PVU
Pressure
X9LK\JLK^H[LYÅV^ *OLJRW\TWVWLYH[PVUVY^H[LY]HS]LVWLYH[PVUZL[[PUN
PUOLH[PUN 7S\NNLKZ[YHPULYVYÄS[LYJSLHUVYYLWSHJL
*OLJR^H[LYÅV^HKQ\Z[[VWYVWLYÅV^YH[L7\TWVY
]HS\L¬;
XWH[LY[LTWLYH[\YLV\[VMYHUNL )YPUN^H[LY[LTW^P[OPUKLZPNUWHYHTL[LYZ
X9LK\JLKHPYÅV^ *OLJRMVYKPY[`HPYÄS[LYHUKJSLHUVYYLWSHJL
PUJVVSPUN *OLJRMHUTV[VYVWLYH[PVUHUKHPYÅV^YLZ[YPJ[PVUZ
TVVOPNOVML_[LYUHSZ[H[PJJOLJRZ[H[PJ]ZISV^LY[HISL
X Air [LTWLYH[\YLV\[VMYHUNL TVVT\JOJVSK]LU[HPYIYPUNLU[LYPUNHPY[LTW^P[OPU
KLZPNUWHYHTL[LYZ
XX0UZ\MÄJPLU[JOHYNL *OLJRMVYYLMYPNLYHU[SLHRZ
3V^+PZJOHNL
Air Temperature
in Heating
XTVVOPNOVMHPYÅV^ *OLJRMHUTV[VYZWLLKZLSLJ[PVUHUKHPYÅV^JOHYt
X7VVYWLYMVYTHUJL :LL¸0UZ\MÄJPLU[*HWHJP[`¹
High Humidity
XTVVOPNOVMHPYÅV^ *OLJRMHUTV[VYZWLLKZLSLJ[PVUHUKHPYÅV^JOHY[
9L[\YUHPY[LTWTH`IL[VVSV^
XUUP[V]LYZPaLK 9LJOLJRSVHKZHUKZPaPUNJOLJRZLUZPISLJSNSVHKHUK
OLH[W\TWJHWHJP[`
X
X
Performance Troubleshooting
A-F
A-F

Troubleshooting Guide - Tranquility® Digital (DXM2) Packaged Units
Rev.: 01/15/14
18 Geothermal Heat Pump Systems
Performance Troubleshooting
Symptom Htg Clg Possible Cause Solution
Only Compressor
Runs
XX;OLYTVZ[H[^PYPUN *OLJR.^PYPUNH[OLH[W\TW1\TWLY.HUK9MVYMHU
VWLYH[PVU
XX-HUTV[VYYLSH`
1\TWLY.HUK9MVYMHUVWLYH[PVU*OLJRMVY3PUL]VS[HNL
HJYVZZISV^LYYLSH`JVU[HJ[Z
*OLJRMHUWV^LYLUHISLYLSH`VWLYH[PVUPMWYLZLU[)
XX-HUTV[VY *OLJRMVYSPUL]VS[HNLH[TV[VY*OLJRJHWHJP[Vr
XX;OLYTVZ[H[^PYPUN *OLJR[OLYTVZ[H[^PYPUNH[VY+?47\[PU;LZ[4VKL
HUK[OLUQ\TWLY@HUK>[V9[VNP]LJHSSMVYMHU
JVTWYLZZVYHUKLSLJ[YPJOLH[
Unit Doesn't
Operate in Cooling
X9L]LYZPUN=HS]L
:L[MVYJVVSPUNKLTHUKHUKJOLJR=(*VURVJVPS
0MRVPZZ[\JRY\UOPNOWYLZZ\YL\WI`YLK\JPUN^H[LYÅV^
HUK^OPSLVWLYH[PUNLUNHNLHUKKPZLUNHNLRVJVPS]VS[HNL
[VW\ZO]HS]L
X;OLYTVZ[H[ZL[\W
X;OLYTVZ[H[^PYPUN *OLJR6^PYPUNH[OLH[W\TW+?4YLX\PYLZJHSSMVY
JVTWYLZZVY[VNL[9=JVPS¸*SPJR¹
Modulating Valve
Troubleshooting
X
0TWYVWLYV\[W\[ZL[[PUN =LYPM`[OL(6Q\TWLYPZPU[OL=WVZP[PVU
5V]HS]LVWLYH[PVU *OLJR]VS[HNL[V[OL]HS]L
X5V]HS]LV\[W\[ZPNUHS *OLJR+*]VS[HNLIL[^LLU(6HUK.5+:OV\SKIL6
^OLU]HS]LPZVMMHUKIL[^LLU]HUK]^OLU]HS]L
PZVU
9LWSHJL]HS]LPM]VS[HNLHUKJVU[YVSZPNUHSZHYLWYLZLU[H[
[OL]HS]LHUKP[KVLZUV[VWLYH[L
-VY+?4JOLJRMVY¸6¹9=ZL[\WUV[¸)¹PM\ZLZJVU]Z[H[
A-F
A-F

19
Troubleshooting Guide - Tranquility® Digital (DXM2) Packaged Units
Rev.: 01/15/14
Functional Troubleshooting
Fault Htg Clg Possible Cause Solution
Main Power Problems X X Green status LED off
Check Line Voltage circuit breaker and disconnect
between 197-254 volts
Check for line voltage between L1 and L2 on the contactor
Check for 24VAC between R and C on DXM 18-31.5
Check primary/secondary voltage on transformer
HP Fault Code 2
X9LK\JLKVYUV^H[LYÅV^ Check pump operation or valve operation/setting
in cooling *OLJR^H[LYÅV^HKQ\Z[[VWYVWLYÅV^YH[L
XWater temperature out of range in
cooling Bring water temp within design parameters.
Water is too warm.
X9LK\JLKVYUVHPYÅV^
*OLJRMVYKPY[`HPYÄS[LYHUKJSLHUVYYeplace
in heating *OLJRMHUTV[VYVWLYH[PVUHUKHPYÅV^Yestrictions
Dirty air coil- construction dust etc.
Too high of external static. Check static vs blower table
XAir temperature out of range in
heating Bring return air temp within design parameters
XX
Overcharged with refrigerant Check superheat/subcooling vs typical operating condition
table
XX
Bad HP switch Check switch continuity and operation - Replace
LP/LOC Fault-Code 3 X X InsufÄJPLU[JOHYge Check for refrigerant leaks
Low Pressure/
Loss of Charge XCompressor pump down at start-
up Check charNLHUKZ[HY[\W^H[LYÅV^
LT1 Fault - Code 4
X9LK\JLKVYUV^H[LYÅV^ Check pump operation or water valve operation/setting
Water Low Temperature
in heating 7S\NNLKZ[YHPULYVYÄS[LY - clean or replace
*OLJR^H[LYÅV^HKQ\Z[[VWYVWLYÅV^YH[L
X Inadequate anti-freeze level *OLJRHU[PMYLLaLZWLJPÄJNYH]P[`^P[OO`KYVTL[LY:LL(9
XImproper low temperature setting
(30°F vs 10°F) *SPW1>3;Q\TWLYMVYHU[PMYLLaL\ZL)LZ\YLSVVW
has 15º freeze protection
X Water temperature out of range Bring water temp within design parameters
X X Bad thermistor Check temp and impedance correlation per chart
LT2 Fault - Code 5
Low Air Temperature
X9LK\JLKVYUVHPYÅV^ *OLJRMVYKPY[`HPYÄS[LYHUKJSLHUVYYeplace
in cooling *OLJRMHUTV[VYVWLYH[PVUHUKHPYÅV^Yestrictions
Too high of external static - check static vs blower table
X Air temperature out of range Too much cold vent air. Bring entering air temp within
KLZPNUWHYHTL[LYZ[OH[064ZWLJPÄLZ
XImproper low temperature setting
(30°F vs 10°F) Normal airside applications will require. Only setting for
packaged units is 30º.
X X Bad thermistor Check temp and impedance correlation per chart
Condensate Fault -
Code 6 High
Condensate Level
X X Blocked drain Check for blockage and clean drain
X X Improper trap Check trap dimensions and location ahead of vent
X Poor drainage Check for piping slope away from unit
Check slope of unit toward outlet
Poor venting - check vent location
X Moisture on sensor Check for moisture shorting to air coil
XX
7S\NNLKHPYÄS[LY
XX9LZ[YPJ[LKYL[\YUHPYÅV^
9LWSHJLHPYÄS[LY
Find and eliminate rectriction - increase return duct and/or
NYPSSLZPaL*OLJRZ[H[PJWYLZZ\YL:LL[OLKPHNYHTVU)+
High Pressure
X Frozen water heat exchanger Thaw heat exchanger (water pressure switches).
XX)HK/7>::^P[JO 9LWSHJL/7>::^P[JO:LL)(
A-F
A-F
208-240

Troubleshooting Guide - Tranquility® Digital (DXM2) Packaged Units
Rev.: 01/15/14
20 Geothermal Heat Pump Systems
Over/Under Voltage -
Code 7
X X Under voltage
Check power supply and 24VAC voltage before and during
operation
(Auto Resetting)
Check power supply wire size
Check compressor starting. Need hard start kit?
Check 24VAC and unit transformer tap for correct power
Z\WWS`]VS[HNL:LL(>
X X Over voltage Check power supply voltage and 24VAC before and during
operation.
Check 24VAC and unit transformer tap for correct power
supply voltage
Unit Performance
Sentinel-Code 8
X Heating Mode LT2>125°F *OLJRMVYWVVYHPYÅV^VYV]LYcharged unit
XCooling Mode LT1>125°F OR
LT2< 40°F *OLJRMVYWVVY^H[LYÅV^VYHPYÅV^
Swapped Thermistor
Code 9 X X LT1 and LT2 swapped Reverse position of thermistors
ECM Fault -
Code 10
X X Blower does not operate *OLJRISV^LYSPUL]VS[HNL:LL)0
Check blower low voltage wiring
Blower operating with incorrect
HPYÅV^
Wrong unit size selection
Wrong unit family selection
Wrong motor size
Incorrect blower selection
Low Air Coil
Pressure Fault
(ClimaDry) Code 11
X9LK\JLKVYUVHPYÅV^PUJVVSPUN
or ClimaDry
Low Air Coil
Temperature Fault -
(ClimaDry) Code 12
X9LK\JLKHPYÅV^PUJVVSPUN
ClimaDry, or constant fan
Air temperature out of range
Check switch continuity and operation - replaceBad pressure switch
Air temperature out of range
Bad thermistor Check temp and impedance correlation per chart
*OLJRMVYKPY[`HPYÄS[LYHUKJSLHUVYYeplace
*OLJRMHUTV[VYVWLYH[PVUHUKHPYÅV^Yestrictions
Too high of external static - check static vs blower table
Too much cold vent air - bring entering air temp within
design parameters
*OLJRMVYKPY[`HPYÄS[LYHUKJSLHUVYYeplace
*OLJRMHUTV[VYVWLYH[PVUHUKHPYÅV^Yestrictions
Too high of external static - check static vs blower table
Too much cold vent air - bring entering air temp within
design parameters
Fault Htg Clg Possible Cause Solution
Functional Troubleshooting
A-F
A-F