Use a multimeter to check the resistance of the EEV coil. If the ohms are outside the manufacturer's specified range (usually around 40-50 ohms depending on the model), the coil needs replacement.
💡 While a reset might temporarily fix the 9c code, it usually points to a hardware issue with the expansion valve or the outdoor PCB that requires professional attention. To give you the best advice, could you tell me: Is your unit a Split or Window model? How old is the AC? Did this happen after a power surge or heavy rain? o general ac error code 9c
Vibrations can loosen the connectors between the EEV and the Outdoor Unit (ODU) PCB. Use a multimeter to check the resistance of the EEV coil