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Service Diagnosis
56
H9, J3, J6, P4
Description
Thermistor or related abnormality
H9:
OUTDOOR AIR THERMISTOR ABNORMALITY
J3:
COMPRESSOR DISCHARGE PIPE THERMISTOR ABNORMALITY
J6:
OUTDOOR HEAT EXCHANGER THERMISTOR ABNORMALITY
P4:
HEAT SINK THERMISTOR ABNORMALITY
Possible Root
cause
1. Disconnection of the connector for the thermistor.
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
*Remark:
Refer to Appendix A for thernistor resistance check procedures.(Page 72, item 6.1)
No
Yes
Turn on the power again.
Check the indoor heat
exchanger thermistor resistance
value in the heating operation.
Check the thermistor resistance
value.
Normal?
J3 error: the discharge
pipe temperature is
lower than the heat
exchanger temperature.
Cooling: Outdoor heat
exchanger
temperature.
Heating: Indoor heat
exchanger
temperature.
No
Yes
Yes
Replace the defective
thermistor(s) of the following
thermistors.
* Outdoor temperature
thermistor.
* Discharge pipe thermistor.
* Outdoor heat exchanger
thermistor.
Error displayed
again on remote
controller?
Indoor heat
exchanger thermistor
functioning?
No
Replace the indoor heat
exchanger thermistor.
Reconnect the connectors
or thermistors.
Replace the outdoor unit PCB.
Summary of Contents for FTXN25L
Page 2: ......
Page 4: ...Table of Contents ii 4 0 Wiring Connection 64 5 0 Refrigerant Diagram 70 6 0 Appendix A 72...
Page 88: ......