Thermistor Or Related Abnormality (Outdoor Unit) - Daikin FTKS20D3VMW Service Manual

SiENBE12-713

5.21 Thermistor or Related Abnormality (Outdoor Unit)

P4, J3, J6, J8, J9, H9
Remote Control
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
Service Diagnosis
5 1 4 2 4 3 1 4
thermistor in the cooling mode, or indoor unit heat exchanger thermistor in the heating
mode)
1
Troubleshooting
263