U1" Reverse Phase, Open Phase - Daikin RTSQ20PY1 Service Manual

Troubleshooting by Indication on the Remote Controller
U1
4.45 " " Reverse Phase, Open Phase
U1
Remote
Controller
Display
Applicable RTSQ8P~16P
Models
Method of The phase of each phase are detected by reverse phase detection circuit and right phase or
reverse phase are judged.
Malfunction
Detection
Malfunction When a significant phase difference is made between phases.
Decision
Conditions
Supposed
Causes
Troubleshooting
295
Power supply reverse phase
Power supply open phase
Defect of outdoor PCB (A1P)
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
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
YES
YES
SiBE31-801_C
Fix the open phase. Requires
inspection of field power supply
section.
Reverse phase Reverse phase
Counter measure of the problem is Counter measure of the problem is
completed by phase replacement. completed by phase replacement.
Replace the outdoor unit PCB
(A1P).
Troubleshooting