Daikin FTX20K2V1B, Service Manual

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SiBE041525F Troubleshooting
Service Diagnosis 66
4.14 Four Way Valve Abnormality
Error Code
EA
Method of Error
Detection
The room temperature thermistor and the indoor heat exchanger thermistor are checked if they
function within their normal ranges in each operation mode.
Error Decision
Conditions
A following condition continues over 10 minute after operating for 5 minutes.
Cooling / Dry
A – B
< –5°C
Heating
B – A
< –5°C
A
: Room thermistor temperature
B
: Indoor heat exchanger temperature

If the error repeats, the system is shut down.
 Reset condition: Continuous run for about 60 minutes without any other error
Supposed
Causes
 Disconnection of four way valve coil
 Defective four way valve, coil, or harness

Defective outdoor unit PCB

Defective thermistor
 Refrigerant shortage
 Water mixed in refrigerant

Defective stop valve