Service diagnosis
40 Domestic air conditioner
10.3.9 Overheat Protection For Discharge Temperature
Outdoor
●
display: LED1 flash 8 times
Met
hod of
The Discharge temperature control is checked with the temperature being detected
●
Malfunction
by the Discharge pipe thermistor
Detection
Malfunction
when the compressor discharge temperature is above 110℃
Decision
Conditions
Supposed ■
Electronic expansion valve defective
Causes ■
Faulty thermistor
■
Faulty PCB
T
roubleshooting
* Caution
Be sure to turn off power switch before connect or disconnect connector, or
else
parts damage may be occurred.
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 ℃ shortly after the
machine starts up?
1) The cryogen may have been leaked during
inst
allation, or there may be leakage in the piping
sy
stem.
2) T
here may be other causes to make the exha
ust
temperatu
re too
high.
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
The results deviate
much?
The sensor is damaged. Replace the sensor
with a new one.
The outdoor mainboard is damaged and needs be
replaced
YES
NO
NO
YES
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