Thermistor Or Related Abnormality (Outdoor Unit) - Daikin SUPER MULTI NX G Series Service Manual

Troubleshooting

5.21 Thermistor or Related Abnormality (Outdoor Unit)

H9, J3, J6, J8, J9, P4
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.
Malfunction A thermistor error is detected by checking the temperature sensed by each thermistor.
Detection
 The thermistor input is above 4.96 V or below 0.04 V with the power on.
Malfunction
 J3 error is judged if the discharge pipe temperature is lower than the heat exchanger
Decision
Conditions
 The system is shut down if all the units are judged as the J8 error.
 Disconnection of the connector for the thermistor
Supposed
 Defective thermistor
Causes
 Defective outdoor unit PCB
 Defective indoor unit PCB
 Defective heat exchanger thermistor in the case of J3 error (outdoor heat exchanger thermistor
133
1 2 3 4
temperature.
in cooling mode, or indoor heat exchanger thermistor in heating mode)
SiUS12-928_A
Service Diagnosis