Vibrations can loosen the connectors between the EEV and the Outdoor Unit (ODU) PCB.
To avoid seeing error code 9c in the future, follow these maintenance tips: o general ac error code 9c
If you are comfortable opening the unit, ensure the wire harness connecting the indoor unit to the outdoor unit is secure. A loose communication wire is a frequent culprit for "9" series errors in O General models. Technical Solutions for Professionals Vibrations can loosen the connectors between the EEV
Technicians sometimes use a powerful magnet to manually "unstick" a seized EEV body. Prevention Tips o general ac error code 9c