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

Troubleshooting

4.19 Thermistor or Related Abnormality (Outdoor Unit)

H9 , J3 , J6 , P4
Remote
Controller
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
Malfunction
Decision
Conditions
Supposed
Causes
In case of " P4 "
Troubleshooting
Replace the outdoor unit PCB.
P4
82
The thermistor input voltage is above 4.96 V or below 0.04 V with the power on.
J3
error is judged if the discharge pipe temperature is lower than the outdoor heat exchanger
temperature.
Disconnection of the connector for the thermistor
Defective thermistor
Defective heat exchanger thermistor in the case of J3 error (outdoor heat exchanger
thermistor in cooling operation, or indoor heat exchanger thermistor in heating operation)
Defective outdoor unit PCB
Defective indoor unit PCB
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
: Radiation fin thermistor
SiBE07-618_C
Service Diagnosis