Thermistor Or Related Abnormality (Outdoor Unit) - Daikin CTXS09GVJU Service Manual

SiUS12-814

5.21 Thermistor or Related Abnormality (Outdoor Unit)

P4, J3, J6, J8, J9, H9
Remote
Controller
Display
Outdoor Unit LED A 5
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 being detected by each thermistor.
Detection
When the thermistor input is above 4.96 V or below 0.04 V with the power on, the J3 error is judged
Malfunction
Decision if the discharge pipe thermistor temperature is smaller than the condenser thermistor temperature,
or the system will shut down if all the units are judged with the J8 error.
Conditions
Supposed
Causes
Service Diagnosis
1 4 2 4 3 1 4 1
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
143