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Troubleshooting for Outdoor Unit SiUS121827E
224 Part 6 Service Diagnosis
7.16 Thermistor or Related Abnormality (Outdoor Unit)
Error Code H9, J3, J6, J8, J9, P4
Outdoor Unit LED
Display
A j 1 i 2 i 3 h 4 h 5 h
Method of Error
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.
Error Decision
Conditions
The voltage between the both ends of the thermistor 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.
Supposed
Causes
Disconnection of the connector for the thermistor
Defective thermistor(s)
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
Troubleshooting In case of P4
Replace the outdoor unit PCB (main PCB).
P4 : Radiation fin thermistor
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
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