Ensure that the fan blades can spin freely. Open the panel and gently try to spin the cross-flow fan (the long horizontal wheel inside the unit) by hand.
Follow these steps to confirm the fault: o general ac error code 9c
This is the #1 cause. The wiring between your indoor and outdoor unit can loosen over time due to vibration from the compressor or poor initial installation. Ensure that the fan blades can spin freely