Daikin R71FUV1 Service Manual page 474

Troubleshooting by Remote Controller
In heating operation
Check items (Possible causes)
Does the outdoor unit fan run
normally?
Is the outdoor unit heat exchanger
clogged?
Is the outdoor unit installed under
such conditions that short circuit
easily occurs?
Is there clogging before or after
the EV (capillary)?
Is the check valve clogged?
Is the LPS normal?
Is the refrigerant shortage?
Judgement
Visual inspection
Visual inspection
Visual inspection
Check if there is a temperature
difference before and after EV
(capillary).
Check if the main valve unit of EV
operates (by noise, vibration).
Check if there is a temperature
difference before and after check
valve.
→ If YES, the check valve is
caught.
Check continuity using a tester.
Conduct refrigerant collection and
vacuum drying, and then add
proper amount refrigerant.
Si20-701_B
467