Daikin R71FUV1 Service Manual page 367

Si20-701_B
Remote Controller Display
U1
Applicable Models
CMSQ
Method of Error Detection
The phase of each phase are detected by reverse phase
detection circuit and right phase or reverse phase are
judged.
Error Decision Conditions
When a significant phase difference is made between
phases
Supposed Causes
Power supply reverse phase
Power supply open phase
Defective outdoor unit PCB (A1P)
Troubleshooting
Caution
There
is an open
phase at the power
supply terminal section
(X1M) of the
outdoor
unit.
NO
Operation is
normal if one
place of power supply
line phase is
replaced.
NO
360
Troubleshooting by Remote Controller
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
may be damaged.
YES
YES
Fix the open
phase. Requires
inspection of
field power
supply section.
Reverse phase
Counter
measure of the
problem is
completed by
phase
replacement.
Replace the
outdoor unit PCB
(A1P).