Daikin VRVII Manual page 273

A
Remove and insert the
connectors.
Has the
inverter PCB caused
damage?
Turn ON the power
supply, and start
operation.
Stop
(standby) before
the fan rotates.
Stop
(standby) when
the compressor
startup.
The U2 error
recurs.
CHECK 4
268
Troubleshooting by Indication on the Remote Controller
YES
NO
YES
NO
YES
NO
YES
NO
Refer to P.354.
Replace the
inverter PCB.
∗ If the inverter
PCB is badly
damaged,
compressor
and fan motor
are likely to
get defective.
Replace the
noise filter PCB.
(Defective noise
filter)
Replace the
inverter PCB.
∗ If the inverter
PCB is badly
damaged,
recheck the
compressor.
Check the
harness.
Continue the
operation.
∗ The error may
temporarily
result from
external
factors.
Causes:
Instantaneous
power failure
(open phase),
noises, or else.