Thermistor Or Related Abnormality (Outdoor Unit) - Daikin 2MKS40G2V1B Service Manual

Troubleshooting for Outdoor Unit

7.11 Thermistor or Related Abnormality (Outdoor Unit)

H9 , J3 , J6 , J8 , J9 , 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
247
The thermistor input is above 4.98 V or below 0.02 V with the power on.
J3
error is judged if the discharge pipe temperature is lower than the heat exchanger
temperature.
The system is shut down if all the units are judged as the J8 or J9 error.
Disconnection of the connector for the thermistor
Defective thermistor
Defective outdoor unit PCB
Defective indoor unit PCB
Defective heat exchanger thermistor in the case of J3 error (outdoor heat exchanger
thermistor in cooling mode, or indoor heat exchanger thermistor in heating mode)
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
: Radiation fin thermistor
SiBE12-816_D
Service Diagnosis