Si20-701_B
Troubleshooting by Remote Controller
466
Evaluation of Abnormal Low Pressure
Abnormally low pressure level is mostly caused by the
evaporator side. The following contents are provided
based on field checking of service engineer. Further, the
number is listed in the order of degree of influence.
In cooling operation
Check items (Possible causes)
Judgement
Does the outdoor unit fan run
normally?
Visual inspection
Is the indoor unit filter clogged?
Visual inspection
Is there clogging before or after
the EV (capillary)?
Check if there is a temperature
difference before and after EV
(capillary).
Check if the main valve unit of EV
operates (by noise, vibration).
Is the check valve clogged?
∗
Heat Pump model only
Check if there is a temperature
difference before and after check
valve.
→
If YES, the check valve is
caught.
Is the LPS normal?
Check continuity using a tester.
Is the indoor unit installed under
such conditions that short circuit
easily occurs?
Visual inspection
Is the refrigerant shortage?
Conduct refrigerant collection and
vacuum drying, and then add
proper amount refrigerant.
CHECK 5