Haier HSU12VHJ(DB), Service Manual

Page: 65 / 115

Domestic Air Conditioner
7.3.6 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
ć
Decision
Conditions
Supposed Ƶ Electronic expansion valve defective
Causes
Ƶ
Faulty thermistor
Ƶ
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
ć
after the machine
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
ć
.
Exhaust temperature
sensor is broken and
needs be replaced
NO
HSU12/18VHJ(DB) Functions and control
62