Thermistor Or Related Abnormality (Outdoor Unit) - Daikin Super Multi NX C-Series Service Manual

Troubleshooting

5.19 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.
Malfunction [A thermistor error is detected by checking the temperature being detected by each thermistor.]
Detection
Malfunction
When the thermistor input is above 4.96 V or below 0.04 V with the power on, the J3 error is
Decision judged if the discharge pipe thermistor temperature is smaller than the condenser thermistor
temperature, or the system will be shut down if all the units are judged with the J8 error.
Conditions
" Connector in poor contact
Supposed
" Thermistor defective
Causes
" Outdoor unit PCB defective
" Indoor unit PCB defective
" Condenser thermistor defective in the case of J3 error (outdoor unit heat exchanger
192
5 1 4 2 4 3 1 4
thermistor in the cooling mode, or indoor unit heat exchanger thermistor in the heating
mode)
1
SiE12-411
Service Diagnosis