Unable to control the speed of the compressor.
There is a problem in the Control Unit. The PFC circuit is damaged.
The compressor cable is disconnected or torn.
The temperature at Discharge exceeds the limit.
The temperature at the Outdoor Coil Circuit is overheated.
The compressor consumes the overcurrent.
The temperature of the heat sink of the control board is too high.
The temperature of the Fan Coil is low. The system accelerates the fan speed to cool the air.
The Fan Coil Unit temperature is low until ice, the system will stop the compressor.
The Condensing Unit is frozen, the system will defrost.
Oil return function (This is a normal operation).
The Service Valve is defective.