Four Way Valve Abnormality - Daikin FTX20K(2)V1B Service Manual

SiBE041525F

4.14 Four Way Valve Abnormality

EA
Error Code
The room temperature thermistor and the indoor heat exchanger thermistor are checked if they
Method of Error
function within their normal ranges in each operation mode.
Detection
A following condition continues over 10 minute after operating for 5 minutes.
Error Decision
Conditions
Cooling / Dry
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
Service Diagnosis
A – B < –5°C
B – A < –5°C
A: Room thermistor temperature
B: Indoor heat exchanger temperature
Troubleshooting
66