37MGRA FH CC (Refrigerant Sensor Error) or EH C3(Refrigerant Sensor is Out of Range) Diagnosis and Solution

37MGRA Diagnostic Codes

Diagnostic codes covered

FH CC, EH C3

  • FH CC – Refrigerant Sensor Error
  • EH C3 – Refrigerant Sensor Is Out of Range

Description: Indoor unit receives fault signal for 10s or indoor unit does not receive feedback from refrigerant sensor for 150s. Recommended parts to prepare: Connection wires, Sensors, Indoor main PCB

Troubleshooting workflow

FH CC (Refrigerant Sensor Error) or EH C3(Refrigerant Sensor is Out of Range) Diagnosis and Solution workflow
FHCC (Refrigerant Sensor Error) or EHC3(Refrigerant Sensor is Out of Range) 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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