Thermistor Or Related Abnormality (Outdoor Unit) - Daikin FTXS09HVJU Service Manual

SiUS04-904

4.17 Thermistor or Related Abnormality (Outdoor Unit)

P4, J3, J6, H9
Remote
Controller
Display
This type of error is detected by checking the thermistor input voltage to the microcomputer.
Method of
[A thermistor error is detected by checking the temperature.]
Malfunction
Detection
Malfunction The thermistor input is above 4.96 V or below 0.04 V with the power on.
Error J3 is judged if the discharge pipe thermistor temperature is lower than the heat exchanger
Decision
thermistor temperature.
Conditions
 Connector in poor contact
Supposed
 Thermistor defective
Causes
 Outdoor unit PCB defective
 Indoor unit PCB defective
 Heat exchanger thermistor defective in the case of J3 error (outdoor unit heat exchanger
128
thermistor in the cooling mode, or indoor unit heat exchanger thermistor in the heating mode)
Troubleshooting
Service Diagnosis