Haier AS09GS1ERA - Overheat Protection for Discharge Temperature

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7.4.7 Overheat Protection For Discharge Temperature 
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Indoor display F4
Outdoor display: LED1 flash 8 time
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Domestic air conditioner
Method of
malfunction
detection
Malfunction
detection
conditions
The discharge temperature control is checked with the temperature being detected by
the discharge pipe thermistor.
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Supposed
causes
Troubleshooting
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Be sure to turn off power switch before connect or disconnect connector, or
else
parts damage may be caused
When the compressor discharge temperature is above 117ć
ƵElectronic expansion valve defective
ƵFaulty thermistor.
ƵFaulty PCB
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 shortly after the machine ć
starts up?
YES
1) The refrigerant lack was caused during
installation.
2) Compressor is fault, replace it with a
new one.
NO
Malfunction occur after running for some time even though
the measured temperature is below 110ć. Pull out the
discharge sensor and measure the resistance normal or
not according to the resistance-temperature table