AUX Air Conditioning Error Codes; HS(Y) HSA(Y) HSB(Y) HSF (Y) HV(Y) HVA(Y) digital display for the series air-conditioner faults: Fault source: PG motor feedback is abnormal Display mode: E4 The display precedence level: 1 Fault source: Plastic temp sensor is abnormal. Display mode: E1 The display precedence level: 2   Fault source: Copper temp sensor