Daikin VRV EMERION REYQ-AATJA Service Manual page 406

Troubleshooting by Error Code
Troubleshooting
399
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Check for the cooling
conditions of cooling tube
used to cool the inverter.
(1) Is the cooling tube plate
fixed with screws?
(2) Error code U0 is displayed
on the Error History
screen.
Normal?
YES
Turn ON the
power supply, and then
press the ON button
continuously. Does
the error
recur?
YES
Power
supply voltage
Power
falls within ±10% of
OFF
the rated voltage?
NO
NO
NO
YES
SiUS372201EB
Rectify troubles.
Continue operation.
Field factor. Power module temperature
may have risen due to high outdoor air
temperature.
Replace the inverter PCB.
Connect to power supply within ±10%
of the rated voltage.
Part 6 Service Diagnosis