Si20-701_B Troubleshooting by Remote Controller
464
Evaluation of Abnormal High Pressure
Abnormally high pressure level is mostly caused by the
condenser side.
The following contents are provided by service engineer
based on their field checks.
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 outdoor unit heat exchanger
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 HPS normal? Check continuity by using a tester.
Is the outdoor unit installed under
such conditions that short circuit
easily occurs?
Visual inspection
Is the piping length 5 meters or
less?
Visual inspection
Does air enter the refrigerant
system?
Conduct refrigerant collection and
vacuum drying, and then add
proper amount refrigerant.
Is the refrigerant overcharged?
Conduct refrigerant collection and
vacuum drying, and then add
proper amount refrigerant.
CHECK 4
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