Malfunctions And Displays; Malfunctions Without Any Display - Panasonic 2WAY Multi Technical & Service Manual

3. Malfunctions and Displays

(1) Malfunctions without any display

The circuit breaker trips when power is turned on
● Short circuit or ground fault of the crankcase heater, current leakage in electrical parts
Circuit breaker trips when operated
● Current leakage or short circuit in fan or coolant pump, current leakage or short circuit in electrical parts
Poor cooling
1) Problem in refrigeration circuit
● Clog in refrigeration circuit, faulty 4-way valve, faulty electric valve in indoor/outdoor unit, compression
failure, or shortage of refrigerant.
● Shutoff valve not completely open
2) Small fan capacity
● Clogged air fi lter, foreign matter in air inlet, outlet
3) Other
● Insuffi cient refrigerant tubing insulation
Poor heating
1) Problem in refrigeration circuit
● Clog in refrigeration circuit, faulty 4-way valve, faulty electric valve in indoor/outdoor unit, compression
failure, or shortage of refrigerant.
● Shutoff valve not completely open
2) Other
● Insuffi cient refrigerant tubing insulation
Heating on standby does not clear
● Warm air is striking the room temperature sensor, temperature around room temperature sensor is high,
faulty indoor control board
Auto-fl ap does not move well
1) The fl aps swing, but wind direction cannot be set
● Auto-fl ap limit switch is faulty or has a bad connection
2) Does not move (swing, air direction setting)
● Auto-fl ap is faulty, indoor control board is failed, remote controller is faulty
Loud operation noise or vibration noise
1) Noise or vibration when fan operates
● Fan is unbalanced, worn motor axis bearing, loose fan securing screw
2) Loud operation noise or vibration noise when compressor operates
● Something is coming into contact with the refrigerant tubing or compressor
Water leakage
1) Drain water leakage
● Clogged drain tube, mistake in draintube construction, insuffi cient draintube insulation
2) Condensation on refrigerant tubing
● Insuffi cient tubing insulation
3) Condensation at duct outlet
● Insuffi cient wind capacity, gap between duct connections
Does not stop
● Fused magnetic contactors, faulty indoor/outdoor control board, faulty remote controller
No display on the remote controller
● Remote controller wiring disconnected
● Remote controller wiring shorted
III–1