Error Codes - Haier AW07LC2VHA Technical Overview

Error Codes Related To The MODULE Board Operation
Error Code 2
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
• refrigeration circuit restriction
• seized compressor
• Bad Module Board
Error Code 4
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 5
This code indicates the Module board is working very hard
to operate the compressor. The most likely cause of the
compressor overworking is refrigerant overcharge. Recover
the refrigerant charge. Weigh the proper charge into the
system and retry operation.
Error Code 6
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.
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OUTDOOR UNIT ERROR CODES
Error Codes Related to the MODULE Board Operation

ERROR CODES

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 18
Module board detected unstable to flow to the compressor.
The power output to the compressor will be stopped to
protect the compressor motor windings.
Possible causes include:
• Line voltage spike
• Poor line voltage supply
Error Code 23
This code indicates the temperature of the MODULE Board
is too hot. This error was generated by a temperature
sensor located on the MODULE Board heat sink. Causes of
overheating are typically overcharge of refrigerant, or very
hot operating temperatures.
Error Code 25
The electrical current flow in the Module is too high.
• Possible Causes: Hard starting compressor
• Refrigeration circuit overcharge
• Refrigeration circuit restriction
• Compressor Seized
• Excessive high load in conditioned space
• Running system in heat mode at high outdoor air
temperature