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Domestic air conditioner
HSU-09/12RS03/R2(SDB) Service Diagnosis
Detection
Malfunction The thermistor input is above 4.9V or below 0.1V with the power on.
Decision
Conditions
* Note:
The values may vary slightly in some models
Supposed
Ƶ
Faulty connector connection
Causes
Ƶ
Faulty thermistor
Ƶ
Faulty PCB
Troubleshooting
* Caution
Be sure to turn off power switch before connect or disconnect connector, or
else parts damage may be occurred.
NO
YES
NO
YES
7.4.6 Overheat Protection For Exhaust Temperature
Indoor display F4
outdoor display LED1 flash 8 times
Method of the exhaust temperature control is checked with the temperature being detected
Malfunction by the exhaust pipe thermistor
Detection
Malfunction when the compressor discharge temperature is above 117ć
Decision
Conditions
Supposed
Ƶ
Electronic expansion valve defective
Causes
Ƶ
Faulty thermistor
Ƶ
Faulty PCB
Troubleshooting
* Caution
Be sure to turn off power switch before connect or disconnect connector, or
else parts damage may be occurred.
Is it normal?
Check the connector connection.
Thermistor resistance check
Correct the connection
Is it normal?
Replace the thermistor
Replace the outdoor unit PCB
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