Haier 1U12BS3ERA Service Manual page 49

11.4.9 Overheat Protection For Discharge Temperature
Outdoor diplay
Method of
malfunction detection
Malfunction detection
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
the temperature exceeds
110
machine starts up?
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
much?
The outdoor mainboard is damaged and needs be
replaced
LED1 flash 8 times
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,
parts damage may be occurred.
shortly after the
NO
temperatures according
results deviate
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.
47
Installations
or else
Domestic air conditioner