Troubleshooting
Si10-417
58
Service Diagnosis
5.2.16 Four Way Valve Abnormality
Remote
Controller
Display
EA
Method of
Malfunction
Detection
The liquid pipe temperature thermistor, the outdoor air
temperature thermistor and the outdoor unit heat
exchanger thermistor are checked to see if they function
within their normal ranges in the operating mode.
Malfunction
Decision
Conditions
A following condition occurs after 3 minutes of the
compressor start.
Cooling / dry operation
(outdoor unit heat exchanger temp. – liquid pipe
temp.) < –5°C
Heating
(liquid pipe temp. – outdoor unit heat exchanger
temp.) < 0°C
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
Si10-417.fm Page 58 Wednesday, September 22, 2004 6:38 PM
