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

SiEN12-710A

4.17 Thermistor or Related Abnormality (Outdoor Unit)

P4, J3, J6, J8, J9, H9
Remote Control
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.
Decision Error J3 is judged if the discharge pipe thermistor temperature is smaller than the condenser
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 " Connector in poor contact
Causes " Thermistor defective
" Outdoor unit PCB defective
" Indoor unit PCB defective
" Condenser thermistor defective in the case of J3 error (outdoor unit heat exchanger
Service Diagnosis
thermistor in the cooling mode, or indoor unit heat exchanger thermistor in the heating
mode)
Troubleshooting
131