Daikin FTXN25L Service Manual page 64

Description Thermistor or related abnormality
OUTDOOR AIR THERMISTOR ABNORMALITY
H9:
COMPRESSOR DISCHARGE PIPE THERMISTOR ABNORMALITY
J3:
OUTDOOR HEAT EXCHANGER THERMISTOR ABNORMALITY
J6:
P4: HEAT SINK THERMISTOR ABNORMALITY
Possible Root 1. Disconnection of the connector for the thermistor.
cause 2. Thermistor corresponding to the error code is defective.
3. 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).
4. Defective outdoor unit PCB.
Troubleshooting
J3 error: the discharge
pipe temperature is
lower than the heat
exchanger temperature.
Cooling: Outdoor heat
Heating: Indoor heat
*Remark:
Refer to Appendix A for thernistor resistance check procedures.(Page 72, item 6.1)
H9, J3, J6, P4
Turn on the power again.
Error displayed
again on remote
controller?
Yes
Check the thermistor resistance
value.
Normal?
Yes
exchanger
temperature.
exchanger
temperature.
Check the indoor heat
exchanger thermistor resistance
value in the heating operation.
Indoor heat
exchanger thermistor
functioning?
Yes
No
Reconnect the connectors
Replace the defective
thermistor(s) of the following
thermistors.
No
* Outdoor temperature
thermistor.
* Discharge pipe thermistor.
* Outdoor heat exchanger
thermistor.
No
Replace the outdoor unit PCB.
Service Diagnosis
or thermistors.
Replace the indoor heat
exchanger thermistor.
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