Troubleshooting DAMA-SM-21-001
85 Service Diagnosis
4.23 Four Way Valve Abnormality
Remote
Controller
Display
EA
Method of
Malfunction
Detection
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
function within their normal ranges in the operating mode.
Malfunction
Decision
Conditions
A following condition continues over 10 minute after operating 5 minutes.
Cooling / dry operation
(room temp.
˗ indoor heat exchanger temp.) < -5°C (23°F).
Heating
(indoor unit heat exchanger temp.
˗ room temp.) < -5°C (23°F).
Supposed
Causes
Connector in poor contact
Thermistor defective
Outdoor unit PCB defective
Four way valve coil or harness defective
Four way valve defective
Foreign substance mixed in refrigerant
Insufficient gas
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