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10.4.9
Overheat Protection for Discharge Temperature
Outdoor display: F4 LED1 flash 8 times
Method of
Check the control of the discharge temperature by the temperature detected by the
Malfunction
discharge pipe thermistor
Detection
Malfunction
When the compressor discharge temperature is above 110℃
Decision
Conditions
■ Electronic expansion valve defective
Supposed
■ Faulty thermistor
Causes
■ Faulty PCB
Trouble
* Caution:
shooting
or else parts damage may be occurred.
Electrify the machine again and turn it on with
the
remote
temperature at the exhaust temperature
sensor of the compressor on the outdoor unit
The temperature exceeds
110 ℃ shortly after the
machine starts up?
Malfunctions occur after running for
some time even though the measured
temperature is below 110℃. Pull out the
exhaust
sensor
resistance at standard
according
temperature table
The results
deviate much?
The outdoor mainboard is damaged
and needs be replaced
Be sure to turn off power switch before connect or disconnect connector
control,
then
measure
NO
and
measure
temperatures
to
the
resistance-
NO
the
The cryogen may have been leaked
during installation, or there may be
YES
leakage in the piping system.
There may be other causes to make
the exhaust temperature too high.
its
YES
The sensor is damaged. Replace
the sensor with a new one.
39
Service Diagnosis
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