Troubleshooting by Remote Controller Si20-701_B
467
In heating 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 the outdoor unit installed under
such conditions that short circuit
easily occurs?
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?
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 refrigerant shortage?
Conduct refrigerant collection and
vacuum drying, and then add
proper amount refrigerant.
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