37MGRA PC A1(Condensation protection of refrigerant pipe diagnosis and solution) – Carrier Enterprise Technical Services & Support

Diagnostic codes covered

PC A1(PCA1)

Description: If outdoor ambient temperature is higher than a certain set value of the refrigerant pipe temperature for a period of time, the LED displays the failure code. Recommended parts to prepare: T4 sensor T5 sensor Main EXV Outdoor PCB Troubleshooting and repair:

Troubleshooting workflow

PC A1(Condensation protection of refrigerant pipe diagnosis and solution) workflow

Related diagnostic checks

37MGRA Temperature Sensor Check
37MGRA EXV Check

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