HSU12HG(DB)-SM Service Diagnosis
57
Domestic Air Conditioner
7.3.6 Overheat Protection For Discharge 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
Electronic expansion valve defective
Causes
Faulty thermistor.
Faulty PCB
Troubleshooting
* Caution
Be sure to turn off power switch before connect or disconnect connector,
or else parts damage may be occurred.
NO
NO
Electrify the machine again and turn it on with the remote controller,
then measure the temperature at the discharge temperature sensor
of the compressor on the outdoor unit
The temperature exceeds
110 ć shortly after the
machine starts up?
1) The cryogen may have been leaked during
installation, or there may be leakage in the piping
system.
2) There may be other causes to make the
discharge temperature too high.
Malfunctions occur after running for some time even
though the measured temperature is below 110ć. Pull
out the discharge sensor and measure its resistance at
standard temperatures according to the
resistance-temperature table
The results deviate
much?
The sensor is damaged. Replace the sensor
with a new one.
The outdoor mainboard is damaged and needs be
replaced
YES
YES
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