Protection and Failure Display When protection display is available, controller will show error code, digital LED shows error code and setting temperature by turns. If there is more than one failure, it will show at first that in front of the error list. Protection display function can be selected in hardware, and the default don’t display; To insure of in and out communist is credibility, the failures relate to outdoor unit will remain failure state for 2 minutes max after recovered. In all failures, only sensor failures don’t have to repower to cancel. Hyundai Air Conditioner Error Codes Error List Error Code Led Code Failure Type E0 RUN, TIMER–both winking In and out communication failure EC RUN, TIMER–both winking Outdoor communication failure E1 RUN-1 time/8s Outdoor sensor E2 RUN-2 times /8s Indoor coil temperature sensor E3 RUN-3 times /8s Outdoor coil temperature sensor E4 RUN-4 times /8s System abnormity E5 RUN-5 times /8s Type mismatch E6 RUN-6 times /8s Indoor fan moto...