Daikin VRV S RXQ4/5ARV1 Service Manual page 310

Troubleshooting by Error Code
Reference
CHECK 4 Refer to page 340.
304
A
Turn ON the power supply,
and then press the ON button.
The
system enters
standby mode before the
outdoor unit fan starts
rotating.
NO
The system
enters standby
mode before completing
the startup operation of the
compressor.
NO
The error U2 recurs.
NO
YES
YES
YES
SiAF332111E
Replace the inverter PCB
(A3P).
Replace the inverter PCB
(A3P).
If the inverter PCB gets
severely damaged, check
for the compressor.
Check for wirings.
Continue operation.
The error could have
resulted from causes such
as instantaneous power
failure.
Part 6 Service Diagnosis