Four Way Valve Fault - Daikin E Series Service Manual

Troubleshooting

2.22 Four Way Valve Fault

EA
Remote
Controller Display
Outdoor Unit LED A5
Display
Method of The room temperature thermistor, the indoor heat exchanger thermistor, the outdoor air
thermistor, and the outdoor heat exchanger thermistor are checked to see if they function within
Malfunction
their normal ranges in the operating mode.
Detection
Malfunction
Decision
Cooling / drying
Conditions
(Room temperature – temperature of indoor heat exchanger) < – 5°C
Heating
(Temperature of indoor heat exchanger – room temperature ) < – 5°C
Supposed
Causes
170
5 5 ( - )
When one of the follow condition continues for 10 min, the compressor stops, and restarts
automatically after 3 minutes standby.
Shut down when the error repeats twice
Clear condition : Continuous operation for 60 minutes.
Improper connector connection
Defective thermistor
Defective outdoor unit PCB
Defective coil or harness of 4-way valve
Defective 4-way valve
Insufficient gas
Foreign substance mixed in refrigerant
SiBE04-624
Service Diagnosis