Daikin R42NUY2S - Page 299

Si20-701_B Troubleshooting by Remote Controller
292
Check the power supply
voltage.
Is
instantaneous
voltage drop
generated?
YES
Correct the
power supply.
Compressor
inspection.
Inspect according
to the diagnosis
procedure for
abnormal noise,
vibration,
operating status,
etc. of the
compressor.
A
NO
YES
Is the
inverter
output voltage
generated
approximately at the
same increasing speed
for each phase after
turning ON
again? (∗1)
(U-V, V-W,
W-U)
NO
Replace the
outdoor unit
PCB.