SiENBE05-722_A Troubleshooting
Service Diagnosis 89
3.19 Thermistor or Related Abnormality (Outdoor Unit)
Remote Control
Display
H9, J3, J6, P4
Method of
Malfunction
Detection
This fault is identified based on the thermistor input voltage to the microcomputer.
A thermistor fault is identified based on the temperature sensed by each thermistor.
Malfunction
Decision
Conditions
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 heat exchanger
temperature.
Supposed
Causes
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
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