This fault can be a result of loose or failing terminations upstream from the compressor. Please check that the connections to the contactor or to the compressor’s common terminal are not loose. Should the problem persist after the connections are found to be secure, then this problem may be a result of afailing circuit breaker or wiring upstream of the contactor. failing circuit breaker or wiring upstream of the contactor. failing circuit breaker or wiring upstream of the contactor.
Since this can be cause of serious electrical fire hazard, a qualified technician should be requested to check the electrical connections immediately.