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