Daikin VRV II-Q RQYQ8-48PY1B Service Manual page 164

Troubleshooting by Remote Controller
Troubleshooting
154
A
Turn ON the power supply,
and start operation.
Stop (standby) before
the fan rotates.
NO
Stop (standby) when
the compressor
startup.
NO
U2
The " "
error recurs.
NO
CHECK 4
Refer to P.182
YES
YES
YES
SiBE341027
Replace the noise filter PCB
(A3P).
(Defect of noise filter)
Replace the inverter PCB (A4P).
If the inverter PCB is badly
damaged, recheck the
compressor.
Check the harness.
Continue the operation.
The error may temporarily
result from external factors.
Causes: Instantaneous
power failure (open phase),
noises, or else.
Service Diagnosis