Thermistor Or Related Abnormality (Outdoor Unit) - Daikin FTKS20CVMB Service Manual

SiENBE04-401A

4.16 Thermistor or Related Abnormality (Outdoor Unit)

P4, J3, J6, H9
Remote control
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
The thermistor input is above 4.96 V or below 0.04 V with the power on.
Malfunction
Error J3 is judged if the discharge pipe thermistor temperature is smaller than the condenser
Decision
thermistor temperature.
Conditions
Supposed
Causes
Service Diagnosis
Connector in poor contact
Thermistor defective
Outdoor unit PCB defective
Indoor unit PCB defective
Condenser thermistor defective in the case of J3 error (outdoor unit heat exchanger
thermistor in the cooling mode, or indoor unit heat exchanger thermistor in the heating
mode)
Troubleshooting
127