Daikin R71FUV1 Service Manual page 376

Troubleshooting by Remote Controller
Power
ON
C
Turn ON the power
supply.
Stop
(standby)
before the fan
rotates.
NO
Stop
(standby) when
the compressor
starts up.
NO
The
U2
" " error
recurs.
NO
YES
Recheck for the
power supply. If
there is no
problem with the
power supply,
replace the
noise filter PCB.
If the error
recurs, replace
the inverter
PCB.
YES
Recheck for the
power supply. If
there is no
problem with the
power supply,
replace the
inverter PCB.
∗If the PCB
replaced is
badly
damaged,
compressor is
likely to get
defective. To
make sure,
recheck the
compressor.
YES
Check the
harness, and
then replace it if
necessary.
End of
measures:
∗The error may
temporarily
result from on-
site causes.
Causes:
Instantaneous
power failure
(open phase),
noises, or else.
Si20-701_B
369