Haier AW07LC2VHA Technical Overview page 42

Indoor Unit Error Codes (HSU218VHG Only)
The error codes that are displayed on the indoor units
may vary from the outdoor unit codes. The information
communicated by the error code will be the SAME for both
indoor and outdoor units even though the numbers may
differ.
Error Code E7
This code is indicating the indoor and outdoor units have lost
communication signal. Check wiring between indoor and
outdoor unit. Confirm 14 gauge AWG stranded wire present.
Confirm no splices in wires 1 and 3. Go to Test Procedures to
solve communication error.
Error Code E1
This code indicates a failure of the room temperature sensor.
Go to Test Procedure section to solve.
Error Code E2
This code indicates a failure of the Pipe Temperature Sensor
on the indoor unit. Go to Test Procedure section to solve.
Error Code E4
This error indicates an EEPROM Error indoor unit control
board. Reset power. If error repeats, replace the indoor circuit
board.
Error Code E14
This code indicates the indoor fan motor failed to run. Go to
Test Procedure Section to solve.
Error Code F12
This code indicates an OUTDOOR UNIT EEPROM error. Cycle
power. If the error does not clear, replace the ECU.
Error Code F1
The module board detected excessive instantaneous current
compressor , IPM hardware automatically stopped the
Module Board output to protect the compressor.
Potential causes include:
• overcharge
• dirty outdoor coil
• hot conditioned space temperature/high load
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INDOOR WALL MOUNT UNIT
Indoor Unit Error Codes
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Error Code F22
Compressor current abnormal: module driver board detected
that the compressor current is too large, The Module board
software protects it and the compressor.
Possible Causes:
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Error Code F3
This code indicates the Module board is not communicating
with the ECU. Check the wiring Plug connection between
the two control boards. Make sure the connection is tight.
The Module Plug connection is Plug CN-9 and the ECU plug
is also Plug CN-9. If the connection is good, yet the boards
do not communicate and the code will not clear, replace the
MODULE Board.
Error Code F19
This code indicates the operating voltage of the system
is either too high or too low. Check line voltage for proper
limits. The line voltage supplied to the outdoor unit should
be now lower than 187V when the compressor starts. The
running voltage should be no lower than 197V. The incoming
line voltage to the outdoor unit should never be higher than
253V. If improper voltage is present, check the supply voltage
circuit from the building for proper size wiring and good
connections. If the voltage is still outside operating limits,
contact the power company to have the service corrected.
If the line voltage from the power company is correct, check
the output voltage of the Power Circuit Board. This voltage
connects to the MODULE board at terminals CN-1 and CN-
2. If the voltage is not within specifications shown above,
replace the Power Circuit Board.
Error Code F27
This error code indicates the compressor failed to start when
a call for operation occurred. Refer to the Test Procedure for
Compressor troubleshooting to diagnose the problem.
ERROR CODES
refrigeration circuit restriction
seized compressor
Bad Module Board
overcharge
dirty outdoor coil
hot conditioned space temperature/high load
refrigeration circuit restriction
seized compressor
Bad Module Board