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

Troubleshooting
5.20

Thermistor or Related Abnormality (Outdoor Unit)

P4, J3, J6, J8, J9, H9
Remote
Controller
Display
Outdoor Unit LED A
Display
Method of This type of error is detected by checking the thermistor input voltage to the microcomputer.
[A thermistor error is detected by checking the temperature being detected by each thermistor.]
Malfunction
Detection
Malfunction When the thermistor input is above 4.96 V or below 0.04 V with the power on, the J3 error is
judged if the discharge pipe thermistor temperature is smaller than the condenser thermistor
Decision
temperature, or the system will be shut down if all the units are judged with the J8 error.
Conditions
Supposed
Causes
200
5 1 4 2 4 3 1 4
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)
1
SiBE12-522
Service Diagnosis