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Error Codes Related To Compressor, Outdoor Fan & 4-Way Valve - Haier 2U18MS2VHB Service Manual

Ductless multi-split heat pump, outdoor/indoor, wall mount - highwall, 2'x2' compact cassette, 3'x3' large cassette, slim duct, mid-static ducted, medium static ducted, console
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Error Code 23
This code indicates an IPM thermal overload. This error
was generated by a temperature sensor located in the IPM
heat sink. Causes of overheating are typically overcharge
of refrigerant, excessively plugged coil, sensor open or
shorted, or a non-condensable in system.
Error Code 26
Module reset indicates possible PCB power anomalies. This
usually occurs when low line voltage conditions are present.
Error Code 27
The IPM has detected that the compressor current is too
Possible Causes:
• Overcharge
• Dirty outdoor coil
• Hot conditioned space temperature or high load
• Refrigeration circuit restriction
• Seized compressor
• Defective IPM
Outdoor Unit Error Codes
Error Codes Related to Compressor, Outdoor Fan &
4-Way Valve
This code indicates the outdoor fan motor is not running. The
fault is detected very quickly by the PCB. The system will shut
off and display this error code. If this error occurs, refer to the
outdoor fan motor test procedure.
This error code indicates that the 4-way valve is not directing
hot gas to the proper coil. Refer to the 4-way valve testing
This error code indicates the compressor failed to start when
a call for operation occurred. Refer to the compressor testing
Error Code 9
Error Code 17
Error Code 24

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