Thermistor Or Related Abnormality (Outdoor Unit) - Daikin Super Multi NX FFQ25B8V1B Service Manual

SiBE121021_C

7.12 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.
A thermistor error is detected by checking the temperature sensed by each thermistor.
Malfunction
Detection
Malfunction
Decision
Conditions
Supposed
Causes
In case of " P4 "
Troubleshooting
Replace the outdoor unit PCB.
P4
Service Diagnosis
j i i h h
1 2 3 4
The thermistor input 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 heat exchanger
temperature.
The system is shut down if all the units are judged as the J8 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
h
5
Troubleshooting for Outdoor Unit
349