Four Way Valve Abnormality - Daikin FTXL20G2V1B Service Manual

Troubleshooting

4.13 Four Way Valve Abnormality

EA
Remote Control
Display
Method of The room temperature thermistor, the indoor heat exchanger thermistor, the outdoor
Malfunction temperature thermistor, and the outdoor heat exchanger thermistor are checked if they function
within their normal ranges in each operation mode.
Detection
Malfunction
A following condition continues over 1 ~ 10 minutes (depending on the model) after operating
Decision for 5 ~ 10 minutes (depending on the model).
„ Cooling / Dry
Conditions
„ Heating
„ If the error repeats, the system is shut down.
„ Reset condition: Continuous run for about 60 minutes without any other error
„ Disconnection of four way valve coil
Supposed
„ Defective four way valve, coil, or harness
Causes
„ Defective outdoor unit PCB
„ Defective thermistor
„ Refrigerant shortage
„ Water mixed in refrigerant
„ Defective stop valve
90
(room thermistor temp. – indoor heat exchanger temp.) < –5°C
(indoor heat exchanger temp. – room thermistor temp.) < –5°C
SiENBE04-925_A
Service Diagnosis