Daikin REYQ-TA Series, Service Manual

Page: 263 / 324

SiUS371614E Troubleshooting by Error Code
Service Diagnosis 250
Refer to page 278.
The
inverter PCB has
damage.
The
system enters
standby mode before the
outdoor fan starts
rotating.
The
system enters
standby mode before
completing the startup
operation of the
compressor.
The error U2 recurs.
NO
NO
YES
YES
NO
YES
NO
YES
Replace the inverter PCB.
(

1)
Check for wirings.
Turn ON the power supply,
and then press the ON button.
Replace the inverter PCB.
If the inverter PCB gets
severely damaged, the
compressor and the fan
motor may have been
damaged.
Replace the inverter PCB.
(

1)
If the inverter PCB gets
severely damaged, check
for the compressor.
Continue operation.
The error could have
resulted from causes such
as instantaneous power
failure.
A
Is the power
transistor normal?
YES
NO
Replace the inverter PCB.
(

1)
Connect and disconnect the
following connectors:
(1) X4A (Inverter PCB)
↔
X20A
(Outdoor unit main PCB)
(2) X6A (Inverter PCB)
↔
X28A
(Outdoor unit main PCB)
CHECK 4
The insulation
resistance of the fan
motor is not more than
1 M
Ω
.
NO
YES
Replace the fan motor.
If the motor gets severely
damaged, the inverter
PCB (

1) should also be
replaced.

1
REYQ72TA: M1C
REYQ96-168TA: M1C, M2C
CHECK 4