Daikin VRV RXYQ72-384XAYCA Service Manual page 334

Troubleshooting by Error Code
Reference
CHECK 4 Refer to page 362.
327
A
The insulation
resistance of the fan
motor is less than
1 M:.
NO
CHECK 4
Is the power
transistor normal?
YES
Connect and disconnect the
following connectors:
(1) X6A (Inverter PCB)lX28A (A1P)
(2) X63A (Inverter PCB)lX40A (A1P)
The
inverter PCB has
damage.
NO
Turn ON the power supply,
and then press the ON button.
The
system enters
standby mode before the
outdoor fan starts
rotating.
NO
The
system enters
standby mode before
completing the startup
operation of the
compressor.
NO
The error U2 recurs.
NO
YES
NO
YES
YES
YES
YES
SiUS342004EB
Replace the fan motor
(M1F, M2F).
If the motor gets severely
damaged, the inverter
PCB should also be
replaced.
Replace the inverter PCB
(A4P).
Replace the inverter PCB.
If the inverter PCB gets
severely damaged, the
compressor and the fan
motor (M1F, M2F) may
have been damaged.
Replace the inverter PCB.
Replace the inverter PCB.
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