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

Troubleshooting
4.17

Thermistor or Related Abnormality (Outdoor Unit)

P4 , J3 , J6 , J8 , J9 , H9
Remote
Controller
Display
Method of This type of error is detected by checking the thermistor input voltage to the microcomputer.
Malfunction [A thermistor error is detected by checking the temperature.]
Detection
Malfunction The thermistor input is above 4.98 V or below 0.02 V with the power on for 5 seconds.
Error J3 is judged if the discharge pipe thermistor temperature is smaller than the condenser
Decision
thermistor temperature.
Conditions
In case of J8 or J9 , the system will be shut down when the error is detected at all of operating
units.
Supposed
Causes
230
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)
SiBE12-712C
Service Diagnosis