Troubleshooting PACD011001C2
370 Troubleshooting Urban Multi “MX1R, ME1R Series” Using R-407C
3.27 Negative Phase, Open Phase
Remote Controller
Display
U1
U1U1
U1
Supposed Causes
„
Power supply negative phase
„
Power supply open phase
„
Defect of outdoor PC board A1P
Troubleshooting
(VF053)
Operation
is normal if one place
of power supply line phase is
replaced.
Fix the open phase. Requires
inspection of field power supply section.
Negative phase.
Disposal of the problem is completed
by phase replacement.
Replace outdoor unit PC board A1P.
YES
YES
NO
NO
There
is an open
phase at the power supply
terminal section (TeS1) of
the outdoor unit.
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
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