Specifications

Troubleshooting SiBE04-624
170 Service Diagnosis
2.22 Four Way Valve Fault
Remote
Controller Display
EA
Outdoor Unit LED
Display
A5 5 5 ( - )
Method of
Malfunction
Detection
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
their normal ranges in the operating mode.
Malfunction
Decision
Conditions

When one of the follow condition continues for 10 min, the compressor stops, and restarts
automatically after 3 minutes standby.
Cooling / drying
(Room temperature – temperature of indoor heat exchanger) < – 5°C
Heating
(Temperature of indoor heat exchanger – room temperature ) < – 5°C

Shut down when the error repeats twice

Clear condition : Continuous operation for 60 minutes.
Supposed
Causes

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