10 Troubleshooting
Checking procedure for main parts
SMGB0136 rev.0 - 07/2021
310
10.4.1.3 Checking procedure for the electronic expansion valve for indoor and outdoor
units
Indoor unit electronic expansion valve Outdoor unit electronic expansion valve
Locked with fully closed
Check the liquid pipe temperature during the heating
process. It is abnormal if the temperature does not
increase.
It is abnormal if the liquid pipe pressure does
not increase during the pump down process.
Locked with slightly open
It is abnormal under the following condition:
The temperature of the freeze protection thermistor
becomes lower than the suction air temperature when
the unit which is under chechink stops and the other
units are under the pump down process.
Electronic expansion valve
Freeze protection thermistor
It is abnormal if the liquid pipe pressure does
not increase and the outlet temperature of
the expansion valve decreases after the
pump down process starts.
Locked with fully open
It is abnormal under the following conditions:
after the heating process for more than 30
minutes, the discharge gas temperature of
the compressor is not 10°C higher than the
condensing temperature and there is no
other faults, such as an excessive charge of
refrigerant and others.
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