III–13. Malfunctions and Displays(1) Malfunctions without any displayc The circuit breaker trips when power is turned on● Short circuit or ground fault of the crankcase heater, current leakage in electrical partsd Circuit breaker trips when operated● Current leakage or short circuit in fan or coolant pump, current leakage or short circuit in electrical partse Poor cooling1) Problem in refrigeration circuit● Clog in refrigeration circuit, faulty 4-way valve, faulty electric valve in indoor/outdoor unit, compressionfailure, or shortage of refrigerant.● Shutoff valve not completely open2) Small fan capacity● Clogged air filter, foreign matter in air inlet, outlet3) Other● Insufficient refrigerant tubing insulationf Poor heating1) Problem in refrigeration circuit● Clog in refrigeration circuit, faulty 4-way valve, faulty electric valve in indoor/outdoor unit, compressionfailure, or shortage of refrigerant.● Shutoff valve not completely open2) Other● Insufficient refrigerant tubing insulationg Heating on standby does not clear● Warm air is striking the room temperature sensor, temperature around room temperature sensor is high,faulty indoor control boardh Auto-flap does not move well1) The flaps swing, but wind direction cannot be set● Auto-flap limit switch is faulty or has a bad connection2) Does not move (swing, air direction setting)● Auto-flap is faulty, indoor control board is failed, remote controller is faultyi Loud operation noise or vibration noise1) Noise or vibration when fan operates● Fan is unbalanced, worn motor axis bearing, loose fan securing screw2) Loud operation noise or vibration noise when compressor operates● Something is coming into contact with the refrigerant tubing or compressorj Water leakage1) Drain water leakage● Clogged drain tube, mistake in draintube construction, insufficient draintube insulation2) Condensation on refrigerant tubing● Insufficient tubing insulation3) Condensation at duct outlet● Insufficient wind capacity, gap between duct connectionsk Does not stop● Fused magnetic contactors, faulty indoor/outdoor control board, faulty remote controllerl No display on the remote controller● Remote controller wiring disconnected● Remote controller wiring shorted
