Honeywell HWAC-1217S User manual

Professional Installation Required!
Please read and retain these troubleshooting instructions.

2
ErrorName
Reference
Code Page
Internal Temperature Sensor Error
E1
External Coil Sensor Error
E2
Internal Coil Sensor Error
E3
Internal Fan Error Of Indoor Unit
E4
Indoor Unit And Outdoor Unit Communication Error
E5
External DC Fan Error
F0
Module Protection Error
F1
PFC Protection Error
F2
Compressor Out-of-Step Error
F3
Exhaust Sensor Error
F4
CompressorTop Head Sensor Error
F5
External Temperature Sensor Error
F6
OVP Or UVP Error
F7
Outdoor Unit Control Panel And ModulePanel
Communication Error
F8
Outdoor Unit EE Error
F9
Recirculated Valve Switch Error
FA
Protectionof Frequency Conversion
FB
ERROR CODES –TABLE OF CONTENTS

3
Causeof Error Cause: Explains the most common error cause.
Inspection path: The order of troubleshooting.
Tools Required Tools that shouldbe utilized to fix/maintenance the error.
Possible Broken Part Any possibly broken part related to the error that may need to
be replaced.
Troubleshooting
Procedures
All the troubleshooting procedures are prepared from simple
to complex, from surface to internal, and from test to
replacement. These procedures cover the most common
causes for an error code to occur.
Key Details Often overlooked key details for licensed professional to
consider.
TERMS GUIDE/TABLE OUTLINE

4
Causeof Error
Cause: The unit detects a short circuit or open circuit of the
indoor temperature sensor during the inspection of main
control panel in the indoor unit, indicated by “internal
temperature sensor error”.
Inspection path: Sensor →Sensor wire →Connectors →
Main indoor unit control panel
Tools Required Multimeter, 15KΩstandard sensor (25℃)
Possible Broken Part Internal temperature sensor, main internal control panel
Troubleshooting
Procedures
1. Check if there’s resistance problem, short circuit or open
circuit in the sensor; the resistance value should be
within a reasonable range (15KΩ under the temperature
of 25℃)
2. Check if the sensor wire is broken.
3. Check if the terminal connectors are well fixed; check if
the weld between the terminal and the main control
panel is loose and pull the terminal slightly for
inspection if necessary.
4. Check if the sensor is damp/wet.
5. If no standard sensor is available, replace the internal
temperature sensor, and then check if the error persists;
if yes, check the main internal control panel and replace it.
Key Details
You can switch the unit to “Fan” mode and judge the accuracy
of the sensor though the temperature displayed on the screen.
DO NOT USE A SENSOR WITH A VALUE LOWER OR HIGHER
THAN 15KΩ
E1 –INTERNAL TEMPERATURE SENSOR ERROR

5
Causeof Error
Cause: The unit detects a short circuit or open circuit of the
outdoor unit coil sensor during the inspection of the outdoor
unit control panel, indicated by “external coil sensor error”.
Inspection path: Sensor →Sensor wire →Connectors →
Main outdoor unit control panel
Tools Required Multimeter, 20KΩstandard sensor (25℃）
Possible Broken Part External coil sensor, outdoor unit control panel
Troubleshooting
Procedures
1. Check ifthere’s resistance problem, short circuit or open
circuit in the sensor; the resistance value should be
within a reasonable range (15KΩ under the temperature
of 25℃)
2. Check if the sensor wire is broken.
3. Check if the terminal connectors are well fixed; check if
the weld between the terminal and the main control panel
is loose and pull the terminal slightly for inspection if
necessary.
4. Check if the sensor is damp/wet.
5. If no standard sensor is available, replace the internal
temperature sensor, and then check if the error persists;
if yes, check the main internal control panel and replace
it.
Key Details DO NOT USE A SENSOR WITH A VALUE LOWER OR
HIGHER THAN 20KΩ
E2 –EXTERNAL COIL SENSOR ERROR

6
Causeof Error
Cause: The detection of short circuit or open circuit of
internal coil sensor during the inspection of main internal
control panel, indicated by “internal coil sensor error”.
Inspection path: Sensor →Sensor wire →Connectors →
Main internal control panel
Tools Required Multimeter, 20KΩstandard sensor (25℃）
Possible Broken Part External coil sensor, outdoor unit control panel
Troubleshooting
Procedures
1. Check if there’s resistance problem, short circuit or open
circuit in the sensor; the resistance value should be
within a reasonable range (15KΩ under the temperature
of 25℃)
2. Check if the sensor wire is broken.
3. Check if the terminal connectors are well fixed; check if
the weld between the terminal and the main control
panel is loose and pull the terminal slightly for
inspection if necessary.
4. Check if the sensor is damp/wet.
5. If no standard sensor is available, replace the internal
temperature sensor, and then check if the error persists;
if yes, check the main internal control panel and replace
it.
Key Details DO NOT USE A SENSOR WITH A VALUE LOWER OR
HIGHER THAN 20KΩ
E3 –INTERNAL COIL SENSOR ERROR

7
Causeof Error
Cause: The PG motor is equipped with a speed feedback signal
line. When the feedback signal is not received by the control
panel, it has no way to recognize the fan moving. This will be
indicated as “Internalfanerror”.
Tools Required Multimeter, A PG motor
Possible Broken Part Mechanical error, PG motor, control panel
Troubleshooting
Procedures
1. Check if the fan can work for 1 minute by itself before the
error occurs. If yes, there is no mechanical error.
2. Disconnect the power supply and move the fan blade by
hand to see if there’sany resistance.
3. Reconnect the drive wire and speed feedback wire to
exclude anyfanerrordue to connector loosening.
4. Check if the plug-in terminal of speed feedback on the
control panel is loose and pull the terminal slightly for
inspection if necessary.
5. Replace the motor in the faulted air conditioner with
other PG motor (do not fix it with the fan for the time
being), if the main control panel still indicates “internal
fan error”, then replace the main internal control panel; if
the error disappears, replace the internal fan.
E4 –INTERNAL FAN ERROR (INDOOR PG MOTOR)

8
Causeof Error
Cause: The frequency converter needs internal and external
communication. When the communication cannot be reached,
the internal and external units will indicate “internal and
external communication error”. Only “main internal control
panel, connecting cable and outdoor unit control panel” are
related to communication; but sometimes the communication
error will be indicated when the external unit has no power
and the internal unit cannot connect with the external unit
due to other errors, then such situation should be
distinguished from “pure communication error” and treated in
a different way.
Inspection paths:
1. Unit powers on and works: Are the internal unit and
external unit matched? → Is the phase sequence of
connecting wires of internal and external units correct?
2. Unit does not power on: Can AC 220V be delivered to the
terminal block of the external unit? → Can the bridge
rectifier and module panel generate DC 310V? →Can the
outdoor unit control panel generate a low voltage power
supply of DC 5V? → Does the main external control panel
show the status of periodical reset?
Tools Required Multimeter, main internal control panel in normal condition
Possible Broken Part Connecting wire phase sequence and contact, main internal
control panel, outdoor unit control panel, module panel
Troubleshooting
Procedures
1. Check if theIDUandtheODUare connected properly.
2. Check the outdoor unit control panel, turn on the unit,
three lights should be lit up, they will then turn off and
the relay will pull in. If this does not occur, there is a power
supply problem.
3. Connect the black signal line S to terminal N of ODU.
Turn on the A/C, if "E5" is still reported, the outdoor unit
control panel needs to be replaced.
E5 –INTERNAL & EXTERNAL COMMUNICATION ERROR

9
Causeof Error
Cause: The main control panel will indicate “external DC fan
error” when it detects an imbalanced current on the three lead
wires of the drive motor.
Inspection path: Is the DC fan stuck due to foreign material?
→Motor terminal connectors →Outdoor unit control panel →
Motor
Tools Required Outdoor unit control panel in normal condition
Possible Broken Part Mechanical jam of external fan, outdoor unit control panel,
external DC motor
Troubleshooting
Procedures
1. Exclude the possibility of a mechanical jam in the fan
motors.
2. Observe if the terminal of the fan is not connected
firmly or the order of the lead wires is correct. If the
external fan of the newly installed unit rotates
reversely, first observe if the color order of the three
lead wires is correct or change the order of any two of
the three lead wires of the motor to see if the fan can
rotate in the correct direction.
Key Details The fan blades may shake for 3-5 seconds and then rotate
slowly when powered on, this is normal.
F0 –EXTERNAL DC FAN ERROR

10
Causeof Error
Cause: The power module is the part to directly drive the
compressor to work. It can protect the machine in time when
overcurrent, overvoltage or overheat occurs and stops the
compressor from working. It will, at the same time, send a
“shutdown request” to the module panel. The error triggered by
the “shutdown request” is called “module protection error”.
Inspection path: Supply voltage → Compressor wire, reactor
wire →System blocked →Module panel damaged →Outdoor
unit control panel destroyed →Compressor destroyed
Tools Required Multimeter, pressure gauge, megameter, module panel
in normal condition
Possible Broken Part Supply voltage, compressor wire, reactor, system pressure,
module panel, outdoor unit control panel, compressor
Troubleshooting
Procedures
1. Check if the supply voltage unstable or volatile. High
system pressure will cause rotation problems to the
compressor.
2. Is the module panel fixed to the radiator firmly? Is the
internal and external heat exchanger dirty? If “module
protection error” is indicated immediately after starting up,
observe if there is any component destroyed by a strike arc
near the module panel; use the multimeter to test if the
resistances between any two compressor wires are the
same. Use the megameter to measure if the resistance
insulation of the three compressor wires against the
ground wire is good (normally at MΩlevel).
3. Test if the 15V and 5V (3.3V) power supply on the module
panel is stable and exclude the module panel error caused
by power supply of the outdoor unit control panel.
4. Replace with the module panel. If the test is normal after
changing the module panel, then the original module panel
is destroyed.
5. If there is only electromagnetic sound and the compressor
does not work; or an irregular sound appears after the
compressor works for a while and then it shuts down; the
compressor may be blocked or destroyed. Consider
replacing the compressor.
F1 –MODULE PROTECTION ERROR

11
Causeof Error
Cause: PFC board is a component of the inverter air
conditioner for power factor correction and voltage
boosting. When the PFC board cannot perform power
calibration as normal because of overcurrent and
overvoltage, it will indicate “PFC protection error”and
its function may also be integrated with the module panel
or main control panel.
Inspection path: Supply voltage →AC and DC power path
→PFC board data wire →PFC board →Main control panel
Tools Required Multimeter, PFC board in normal condition
Possible Broken Part Supply voltage, reactor, PFC board, module panel, outdoor
unit control panel
Troubleshooting
Procedures
1. Check if the supply voltage is unstable or if the
voltage is too low (below AC 135V).
2. Check if the reactor itself is destroyed and the reactor
connecting wire is in poor condition.
3. If “PFC protection error” happens immediately after
startup, observe if there is any component destroyed
by a strike arc near the module panel.
4. Test if the 15V and 5V (3.3V) power supply on the PFC
board is stable.
5. Replace with the PFC board. If the unit is normal after
changing the PFC board, then the original PFC board
is destroyed.
6. If PFC protection error appears and there is no
problem with the supply voltage, reactor connection
or the reactor, replace the controller of the external
unit.
F2 –PFC PROTECTION ERROR

12
Causeof Error
Cause: The module panel will constantly test the current of lead
wires of the compressor and calculate the position of the rotator
of the compressor. When the compressor deviates far from the
normal operating status , it will indicate “compressor out-of-
step error” because the current of the compressor wires is too
high or it cannot detect the position of the rotator. This error
always follows “module protection error”.
Inspection path: supply voltage → Compressor wire, reactor
wire → System blocked → Module panel damaged → Outdoor
unit control panel destroyed → Compressor destroyed
Tools Required Multimeter, pressure gauge, module panel in normal condition
Possible Broken Part Supply voltage, compressor wire, reactor, system pressure,
module panel, outdoor unit control panel, compressor
Troubleshooting
Procedures
1. Check if the supply voltage unstable or volatile. High
system pressure will cause rotation problems to the
compressor.
2. Is the module panel fixed to the radiator firmly? Will it
cause pool cooling? Is the internal and external heat
exchanger dirty? If “compressor out-of-step error” is
indicated immediately after starting up, observe if there
is any component destroyed by a strike arc near the
module panel; use the multimeter to test if the
resistances between any two compressor wires are the
same. Use the megameter to measure if the resistance
insulation of the three compressor wires against the
ground wire is good
(normally at MΩ level).
3. Test if the power supply on the module panel is stable
and exclude the module panel error caused by power
supply of the outdoor unit control panel.
4. Change the module panel, if it is normal, then the
original module panel is destroyed.
5. If there is only electromagnetic sound and the
compressor does not work; or an irregular sound appears
after the compressor works for a while and then it shuts
down; the compressor may be blocked or destroyed.
Consider replacing the compressor.
F3 –COMPRESSOR OUT-OF-STEP ERROR

13
Causeof Error
Cause: The outdoor unit control panel will indicate “exhaust
sensor error” and send it to the main internal control panel
when it detects short circuit or open circuit of the exhaust
sensor.
Inspection path: Exhaust sensor → Sensor wire →
Connectors →Main external control panel
Tools Required Multimeter, 50KΩstandard exhaust sensor
Possible Broken Part Exhaust sensor, outdoor unit control panel
Troubleshooting
Procedures
1. Check if there is any evident resistance problem in the
sensor. if in short circuit or open circuit, the resistance
should maintain in a reasonable range (about 50KΩ when
the compressor is not working and between 3 KΩ and 30
KΩ after the compressor works for a while, the
corresponding exhaust temperature should be
100℃-38℃).
2. Check if the sensor wire or the sensor connecting wire is
damaged.
3. Check if the connecting terminal is connected firmly, the
weld between the terminal and the main control panel is
loose; pull the terminal slightly for inspection if
necessary.
4. Check if the sensor is damp/wet. The coil sensor is quite
easy to be damp/wet in case the lead wire of coil sensor
is above the copper pipe.
5. If there is no standard sensor at hand, exchange the
exhaust sensor with the one beside it to see if the error
changes. If yes, there is something wrong with the sensor
and it should be replaced; if it still indicates
“external coil sensor error”, replace the outdoor unit
control panel.
Key Details DO NOT USE A SENSOR WITH A VALUE LOWER OR HIGHER
THAN 50KΩ
F4 –EXHAUST SENSOR ERROR

14
Causeof Error
Cause: The compressor top head sensor is a compressor top
head temperature protection switch most of the time. It keeps
closed (short circuit) when the compressor temperature is
normal and switches off (open circuit) when the temperature is
too high. The outdoor unit control panel will indicate
“compressor top head sensor error” when it senses
disconnection of the compressor top head protection switch.
Inspection path: Compressor top head sensor (temperature
protection switch) → Sensor wire → Connectors → Outdoor
unit control panel
Tools Required Pressure gauge, multimeter
Possible Broken Part
System pressure, liquid deficiency, compressor top head
sensor (temperature protection switch), outdoor unit control
panel
Troubleshooting
Procedures
1. First check if the compressor top head temperature is too
high (above 110℃) and causes the error. Reasons why
the compressor top head temperature is too high may be:
the system is low in coolant and the compressor idles; the
system is blocked, and the pressure of the compressor is
too high.
2. The temperature protection switch is closed normally.
Test if the terminals of the sensor are in the short-circuit
condition with the multimeter. In the case of open circuit,
then there is something wrong with the sensor or lead
wires.
3. Check if the sensor wire or the sensor connecting wire is
damaged.
4. Check if the connecting terminal is connected firmly. The
weld between the terminal and the main control panel is
loose, pull the terminal slightly for inspection if
necessary.
5. If the compressor top head sensor error disappears after
start up, then replace the sensor; if the error still occurs,
it’s probably the main control panel problem, replace the
outdoor unit control panel.
F5 –COMPRESSOR TOP HEAD SENSOR ERROR

15
Causeof Error
Cause: The detection of short circuit or open circuit of
external termperature sensor during the inspection of
outdoor unit control panel, indicated by "external
termperature sensor error".
Inspection path: Sensor →Sensor wire →Connectors →
Outdoor unit control panel
Tools Required Multimeter, 15KΩstandard sensor
Possible Broken Part External temperature sensor, outdoor unit control panel.
Troubleshooting
Procedures
1. Check if there’s resistance problem, short circuit or open
circuit in the sensor; the resistance value should be
within a reasonable range (15KΩ under the temperature
of 25℃).
2. Check if the sensor wire is broken.
3. Check if the terminal connectors are well fixed; check if
the weld between the terminal and the main control
panel is loose and pull the terminal slightly for
inspection if necessary.
4. Check if the sensor is damp/wet.
5. Replace the external temperature sensor and check if
the error still exists; if the error disappears, replace the
sensor; if the error still exists, it's possible that the main
control panel is faulted, change the outdoor unit control
panel.
Key Details DO NOT USE A SENSOR WITH A VALUE LOWER OR HIGHER
THAN 15KΩ
F6 –EXTERNAL TEMPERATURE SENSOR ERROR

16
Causeof Error
Cause: When the supply voltage is lower than 135V or higher
than 275V, the inspection, circuit would detect over or under
voltage protection signal and send it to the outdoor unit
control panel and the outdoor unit control panel would initiate
an "OVP or UVP error" and indicate it through the internal
motor.
Inspection path: Supply voltage → Internal direct current
voltage →Reactor wiring →Module panel →Outdoor unit
control panel
Tools Required Multimeter
Possible Broken Part Supply voltage, reactor, module panel and outdoor unit control
panel.
Troubleshooting
Procedures
1. First, check the supply environment of the user,
especially should check when the compressor of the
air conditioner has been running for a while. The normal
supply voltage should be between 198V and 242V and
the minimum work assurance range of the air
conditioner should be within 165V and 265V.
2. For the external machines with PFC panels (without
separate rectifier bridges), the operator should ensure
if the PFC function is on with the direct current voltage
grade of the multimeter. When the compressor is
running, voltage between P and N ends detected on the
test module panel or outdoor unit control panel should
be over 200V and if the voltage is below that range, it is
possible that the reactor is faulted, or the PFC is broken.
3. The operator should check and confirm the voltage
inspection circuit is on which control panel first and
then replace it. The regular replacement: for the
external machine of single panel single chip, replace the
external controller directly; and for the machine of two
panels, replace the module panel.
F7 –OVP OR UVP ERROR

17
Causeof Error
Cause: Only the models with the module panels separated
with the outdoor unit control panels may have this error. When
the machine is running normally, the module panel and the
outdoor unit control panel would coordinate with each other
on the communication to work and when the communication
is off, the outdoor unit control panel would raise the alarm of
"main control panel and module panel communication error".
Only "module panel, data line and main external control
panel" are related to such communication.
Inspection path: data line connection →module panel power
→module panel →outdoor unit control panel
Tools Required Multimeter and regular module panel
Possible Broken Part Module panel and main control data line, module panel and
main external control panel.
Troubleshooting
Procedures
1. First check if the communication connection line
(mostly 4 chips) between the module panel and main
control panel gets loose and if the connection is faulted.
2. Measure and check with a multimeter if the power from
the main external control panel is normal and especially
note that if the 5V (3.3V) power is led to the module
panel. Eliminate the possibility that it's not running
normally because there is no 5V (3.3V) power at the
module panel.
3. The maintenance personnel should replace the module
panel of the faulted air conditioner with a regular
module panel taken with him and if the communication
error disappears when the external machine is switched
on, it means the original module panel is faulted and if
the error is still there, maybe the outdoor unit control
panel should be replaced.
F8 –OUTDOOR UNIT CONTROL PANEL AND MODULE PANEL COMMUNICATION ERROR

18
Causeof Error
Cause: Parameters are stored in an “EE” chip for the unit to
run properly. The motor on the outdoor unit control panel can
only work after reading the data stored in EE and if not read,
the alarm "outdoor EE error" would be reported and raised in
the internal machine. Reasons for data not being read are as
follows:
1. Wrong EE chip data format;
2. EE chip is broken;
3. Bad contact of EE or fault of EE reading circuit;
4. Backwards installation of EE chip.
Inspection path: outdoor unit control panel.
Tools Required None
Possible Broken Part Bad contact of EE, outdoor unit control panel.
Troubleshooting Procedures
1. Replacethe outdoorunit control panel directly.
F9 –OUTDOOR EE ERROR

19
Causeof Error
Cause: When the main control panel detects an open circuit
or short circuit of the recirculated sensor, it would raise an
alarm of "recirculated sensor error" and send it to the main
internal control panel to indicateit.
Inspection path: four-way valve →recirculated sensor →
sensor wire →connectors →outdoor unit control panel
Tools Required Multimeter, pressure meter, normal 20KΩ recirculated sensor
Possible Broken Part Four-way valve, recirculated sensor, outdoor unit control panel.
Troubleshooting
Procedures
1. If the error appears in heating mode butnot in cooling
mode, first check if the four-way valve failed to change
the position or there is a back flow, which can be
estimated by measuring the high and low pressures with
the pressure meter. During heating, check if the four-way
valve terminal can switch a circuit of 220V, if yes, then
the four-way valve is faulted; and if there is no circuit over
220V in heating, it means the outdoor unit control valve
is faulted.
2. If it is not the four-way valve that is faulted, check on the
resistance value and short circuit problems and the
resistance value should be within a proper range (around
20KΩat temperature of 25℃).
3. Check if the terminal connectors are well fixed; check if
the weld between the terminal and the main control panel
is loose and pull the terminal slightly for inspection if
necessary.
4. Check if the sensor is damp/wet.
5. Replace the possibly faulted recirculated sensor with a
normal one. If the error is still there, consider replacing
themain external control panel.
FA –RECIRCULATED SENSOR ERROR

20
Causeof Error
Cause: In routine operation of the unit, there will be times
where the unit will need to protect the compressor during
defrost, overheating, or undercooling. Three indicator lights
are used on the outdoor unit control panel to signify this
protection is occurring. The unit will protect the compressor
during defrosting, over current protection, cooling overload
protection, indoor heating high temperature protection, and
indoor cooling freezing protection.
Tools Required Multimeter
Possible Broken Part Regular protection, system blockage, power supply,
resistance value of sensor drifts or is used wrong.
Troubleshooting
Procedures
1. Defrosting: If the unit defrosts frequently, please note
these possible causes: heat exchange of the external unit
is faulted, if the fan revolving speed is low and if the
resistance value of the coil sensor is wrong or the
temperature is inaccurately measured, or it is damaged.
2. Over current protection: It is normal if such protection
appears under a very high temperature cooling status
but not under low temperature low load status.
3. Cooling overload protection: When the outdoor coil
sensor senses the temperature is too high, as to provent
the compressor from overload, it would possitively lower
the frequency and it is normal for the protection under
the high temperature cooling status.
4. Indoor high temperature heating protection: When the
indoor coil sensor senses the temperature is too high, as
to prevent the compressor from overload, it would
positively lower the frequency and it is normal for the
protection in a warm room.
5. Indoor cooling freezing protection: When the indoor coil
sensor senses the temperature is too low, it would
possitively lower the frequency and it is normal for the
protection in a low temperature room.
FB –PROTECTION OF FREQUENCY CONVERSION