Daikin R71FUV1 Service Manual page 366

Troubleshooting by Remote Controller
Remote Controller Display
U1
Applicable Model
R(Y)-LU, RR-M, RZQ-C7
Method of Error Detection
The reverse phase detection circuit detects the phase of
each phase and judge whether it is normal or reverse.
Possible Causes
Defective connection of power supply wiring
Disconnection in power supply wiring
Troubleshooting
Caution
Turn OFF the power
supply and turn the power
ON.
Error is
displayed again.
YES
Are the
phases of circuit
breaker matched?
Does
imbalance in
the power supply
voltage occur?
(±10%)
NO
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
may be damaged.
NO
YES
NO
YES
Si20-701_B
External factor
(Noise, etc.)
Interchange the
power supply
cables.
Check for the
power supply
facilities.
Replace the
outdoor unit
PCB.
359