O General Ac Error Code 9c [new] -

Disclaimer: The following steps require an electrical multimeter and should ideally be executed by a certified HVAC technician.

They will measure the communication voltage (typically a fluctuating DC voltage) between the ground/neutral wire and the signal wire. If the voltage is steady or completely absent, it confirms a communication interruption. o general ac error code 9c

The thermistors might need to be checked. Conclusion o general ac error code 9c

Is the indoor unit fan , or is the whole system dead? o general ac error code 9c

: Loose or damaged wires connecting the indoor and outdoor units can sometimes mimic a board mismatch. Ensure all terminal connections are tight and there are no breaks in the signal wire. Professional Maintenance