Fourway Valve Abnormality - Daikin FTXS30LVJU Service Manual

Troubleshooting

4.16 FourWay Valve Abnormality

EA
Remote
Controller
Display
Method of
The room temperature thermistor and the indoor heat exchanger thermistor are checked if they
Malfunction function within their normal ranges in each operation mode.
Detection
Malfunction
A following condition continues over 1 ~ 10 minutes after operating for 5 ~ 10 minutes.
 Cooling / Dry
Decision
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 fourway valve coil
Supposed
 Defective fourway valve, coil, or harness
Causes
 Defective outdoor unit PCB
 Defective thermistor
 Refrigerant shortage
 Water mixed in refrigerant
 Defective stop valve
119
(room thermistor temp. – indoor heat exchanger temp.) < –5°C (–9°F)
(indoor heat exchanger temp. – room thermistor temp.) < –5°C (–9°F)
SiUS091133
Service Diagnosis