37MGRA EH 0b(IDU Main Control Board and Display Board Communication Error Diagnosis and Solution)

Diagnostic codes covered

EH 0B

Description: Indoor PCB does not receive feedback from the display board. Recommended parts to prepare: Communication wire, Indoor PCB, Display board Troubleshooting and repair:

Troubleshooting workflow

EH 0b(IDU Main Control Board and Display Board Communication Error Diagnosis and Solution) workflow — EH0b(IDU Main Control Board and Display Board Communication Error Diagnosis and Solution) workflow

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