37MGRA PC 40 (Communication error between ODU main chip and compressor driven chip diagnosis and solution)

37MGRA Diagnostic Codes

Diagnostic codes covered

PC 40

Description: The main PCB cannot detect the IPM board. Recommended parts to prepare: Connection wires, Outdoor PCB, IPM module board, Electric control box Troubleshooting and repair:

Troubleshooting workflow

PC 40 (Communication error between ODU main chip and compressor driven chip diagnosis and solution) workflow
PC40 (Communication error between ODU main chip and compressor driven chip diagnosis and solution) workflow

Related diagnostic checks

Workflow source: original 37MGRA-02SM service-manual PDF. Error-code names cross-checked against 37MGRA-04SI.

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