Four Way Valve Abnormality - Daikin FTKN09NMVJU Service Manual

Troubleshooting

4.14 Four Way Valve Abnormality

EA
Error Code
Method of Error The room temperature thermistor and the indoor heat exchanger thermistor are checked if they
function within their normal ranges in each operation mode.
Detection
Error Decision A following condition continues over 10 minutes after operating for 5 minutes.
Conditions
Supposed
Causes
77
Cooling / Dry
A – B < –5°C (A – B < –9°F)
Heating
B – A < –5°C (B – A < –9°F)
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
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
SiUS041501E
Service Diagnosis