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TROUBLESHOOTING & REFERENCES
J-19
ENGLISH
Outdoor Unit Error Codes
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
high.
Possible Causes:
• Overcharge
• Dirty outdoor coil
• Hot conditioned space temperature or high load
• Refrigeration circuit restriction
• Seized compressor
• Defective IPM
Error Codes Related to Compressor, Outdoor Fan &
4-Way Valve
Error Code 9
This code indicates the outdoor fan motor is not running. The
fault is detected very quickly by the PCB. The system will shut
o and display this error code. If this error occurs, refer to the
outdoor fan motor test procedure.
Error Code 17
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
procedure.
Error Code 24
This error code indicates the compressor failed to start when
a call for operation occurred. Refer to the compressor testing
procedure.
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