Four Way Valve Abnormality - Daikin CTX Series Service Manual

Troubleshooting

4.23 Four Way Valve Abnormality

EA
Remote
Controller
Display
Method of The indoor air temperature thermistor, the indoor unit heat exchanger thermistor, the outdoor
temperature thermistor and the outdoor unit heat exchanger thermistor are checked to see if the
Malfunction
function within their normal ranges in the operating mode.
Detection
Malfunction
A following condition continues over 10 minute after operating 5 minutes.
 Cooling / dry operation
Decision
Conditions
 Heating
 Connector in poor contact
Supposed
 Thermistor defective
Causes
 Outdoor unit PCB defective
 Four way valve coil or harness defective
 Four way valve defective
 Foreign substance mixed in refrigerant
 Insufficient gas
82
˗
(room temp. indoor heat exchanger temp.) <
(indoor unit heat exchanger temp.
-
5°C (-9°F).
˗
-
room temp.) < 5°C (-9°F).
DAMA-SM-21-003
Service Diagnosis