Haier 1U18FS2ERA Service Manual page 77

8.4.9 Overheat Protection For Exhaust Temperature
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 110
Decision
Conditions
Supposed
Causes
Troubleshooting * Caution Be sure to turn off power switch before connect or disconnect connector,
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 temperatures
resistance-temperature table
the
much?
The outdoor mainboard is damaged and needs be
replaced
Electronic expansion valve defective
Faulty thermistor
Faulty PCB
else parts damage may be occurred.
shortly after the
NO
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.
75
Service Diagnosis
Domestic Air Conditioner
or