Daikin VRV - WII Service Manual page 224

SiUS30-604
Troubleshooting
Troubleshooting
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
Check for the power supply
conditions.
Does the voltage fall in the
range of 208 to 230V±10%?
Is there any open phase or
erroneous wire connection?
Does the unbalanced voltage
fall within 6V?
Any of the
conditions aforementioned
is defective.
The compressor
has an insulation resistance
of 100kΩ or less.
NO
Is the
power transistor normal?
∗
YES
Connect and disconnect the
following connectors.
X4A (A2P) ↔ X25A (A1P)
X6A (A2P) ↔ X33A (A1P)
The inverter PCB
(A2P) is damaged.
NO
Turn ON the power supply, and
then set the RUN switch to ON.
The compressor
enters standby mode
without completing the
startup sequence.
NO
The "U2" malfunction
recurs.
NO
∗ Power transistor check: Refer page 281.
Troubleshooting by Indication on the Remote Controller
YES
YES
NO
YES
YES
YES
Remedy the defective
conditions.
Replace the compressor.
Replace the inverter PCB
(A2P).
Replace the inverter PCB
(A2P).
If the inverter PCB is
significantly damaged,
the compressor or the
fan motor may be
damaged as well.
Replace the inverter PCB
(A2P).
If the inverter PCB is
significantly damaged,
check for the
compressor.
Check for every wire
connection.
Continue the compressor
operation.
It is supposed that the
faulty power supply
results from external
causes such as
instantaneous power
failure.
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