Haier N Series Service Manual page 59

. .9 Overheat Protection For Discharge Temperature
Outdoor display: LED1 flash 8 times
Method of
malfunction detection
Malfunction detection
conditions
Conditions
Supposed
Causes
Troubleshooting
Electrify the machine again and turn it on with the remote controller,
then measure the temperature at the exhaust temperature sensor of
the compressor on the outdoor unit
Malfunctions occur after running for some time even
though the measured temperature is below 110 . Pull
out the exhaust sensor and measure its resistance at
standard
resistance-temperature table
The outdoor mainboard is damaged and needs be
replaced
The Discharge temperature control is checked with the temperature being detected
by the Discharge pipe thermistor
when the compressor discharge temperature is above 110
■ Electronic expansion valve defective
■ Faulty thermistor
■ Faulty PCB
* Caution Be sure to turn off power switch before connect or disconnect connector,
else parts damage may be occurred.
The temperature exceeds
110 shortly after the
machine starts up?
NO
temperatures according
The results deviate
much?
NO
1) The cryogen may have been leaked during
YES
installation, or there may be leakage in the piping
system.
2) There may be other causes to make the exhaust
temperature too high.
to the
YES
The sensor is damaged. Replace the sensor
with a new one.
Service diagnosis
Domestic air conditioner
or