Daikin VRV RXYQ72-384XAYCA, Service Manual

Page: 334 / 419

Troubleshooting by Error Code SiUS342004EB
327 Part 6 Service Diagnosis
Reference
CHECK 4 Refer to page 362.
The
in v erter PCB has
damage.
The
system enters
stand b y mode b efore the
o u tdoor fan starts
rotating.
The
system enters
stand b y mode b efore
completing the start u p
operation of the
compressor.
The error U2 rec u rs.
NO
NO
YES
YES
NO
YES
NO
YES
Replace the in v erter PCB.
Check for wirings.
T u rn ON the power s u pply,
and then press the ON bu tton.
Replace the in v erter PCB.
If the in v erter PCB gets
se v erely damaged, the
compressor and the fan
motor (M1F, M2F) may
ha
v e b een damaged.
Replace the in v erter PCB.
If the in v erter PCB gets
se v erely damaged, check
for the compressor.
Contin u e operation.
The error co u ld ha v e
res u lted from ca u ses s u ch
as instantaneo u s power
fail u re.
A
Is the power
transistor normal?
YES
NO
Replace the in v erter PCB
(A4P).
Connect and disconnect the
following connectors:
(1) X6A (In
v erter PCB) X28A (A1P)
(2) X63A (In v erter PCB) X40A (A1P)
CHECK 4
The ins u lation
resistance of the fan
motor is less than
1 M .
NO
YES
Replace the fan motor
(M1F, M2F).
If the motor gets se v erely
damaged, the in v erter
PCB sho u ld also b e
replaced.