Overheat Protection For Exhaust Temperature - Haier HSU-18,22HVA103/R2(DB) Service Manual

7.2.6 Overheat Protection For Exhaust Temperature

Indoor display
outdoor display
Method of the exhaust temperature control is checked with the temperature being detected
Malfunction by the exhaust pipe thermistor
Detection
when the compressor discharge temperature is above 117℃
Malfunction
Decision
Conditions
Supposed ■ Electronic expansion valve defective
Causes ■ Faulty thermistor
■ Faulty PCB
* Caution Be sure to turn off power switch before connect or disconnect connector,
Troubleshooting
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
Measure the temperature at the exhaust temperature
sensor of the compressor on the outdoor unit
Malfunctions occur after running for
some time? even though the
asured temperature is below 117℃.
Pull out the exhaust sensor and measure its resistance
at standard temperatures
resistance-temperature table
HSU-18,22HVA103/R2(DB)
F4
LED1 flash 8 times
else parts damage may be occurred.
?
NO
NO
according to the
1) The cryogen may have been leaked during
installation, or there may be leakage in the piping
YES
system.
2) There may be other causes to make the exhaust
temperature too high.
YES
Exhaust temperature sensor is broken and needs be
replaced
YES
The sensor is damaged. Replace the sensor with a new
one.
82
Service Diagnosis
or
Domestic Air Conditioner