7.2.6 Overheat Protection For Exhaust Temperature
Indoor display F4
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 117℃
Decision
Conditions
Supposed ■
Electronic expansion valve defective
Causes ■
Faulty thermistor
■
Faulty PCB
Troubleshooting
* Caution
Be sure to turn off power switch before connect or disconnect connector, or
else parts damage may be occurred.
YES
NO
the temperature exceeds
110 shortly after the ℃
machine starts u
p?
1) The cryogen may have been leaked during
installation, or there may be leakage in the piping
system.
2) There may be other causes to make the exhaust
temperature too high.
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
Measure the temperature at the exhaust temperature
sensor of the compressor on the outdoor unit
YES
Malfunctions occur after running for
some time?
even though the
asured temperature is below 117℃.
Exhaust temperature sensor is broken and needs be
re
placed
Pull out the exhaust sensor and measure its resistance
at standard temperatures according to the
resistance-temperature table
YES
The sensor is damaged. Replace the sensor with a new
one.
NO
HSU-18,22HVA103/R2(DB) Service Diagnosis
82
Domestic Air Conditioner
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