The outdoor mainboard is damaged
and needs be replaced
10.4.9 Overheat Protection for Discharge Temperature
Outdoor display: F4 LED1
flash 8 times
Check the control of the discharge temperature by the temperature 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
or else parts damage may be occurred.
Malfunction
Decision
Conditions
Method of
Malfunction
Detection
The temperature exceeds
110 ℃ shortly after the
machine starts up?
The cryogen may have been leaked
during installation, or there may be
leakage in the piping system.
There may be other causes to make
the exhaust temperature too high.
Electrify the machine again and turn it on with
the remote control, then measure the
temperature at the exhaust temperature
sensor of the compressor on the outdoor unit
The results
deviate much?
The sensor is damaged. Replace
the sensor with a new one.
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
according
to
the resistance-
temperature table
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