In Heating Operation - Daikin R71FUV1 Service Manual

Troubleshooting by Remote Controller

In heating operation

Check items (Possible causes)
Does the indoor unit fan run
normally?
Is the indoor unit heat exchanger
clogged?
Is the indoor unit installed under
such conditions that short circuit
easily occurs?
Is there clogging before or after
the EV (capillary)?
Is the check valve clogged?
∗ Heat Pump model only
Is the HPS normal?
Is the piping length 5 meters or
less?
Does air enter the refrigerant
system?
Is the refrigerant overcharged?
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.
Visual inspection
Conduct refrigerant collection and
vacuum drying, and then add
proper amount refrigerant.
Conduct refrigerant collection and
vacuum drying, and then add
proper amount refrigerant.
Si20-701_B
465