Negative Phase, Open Phase - Panasonic Urban Multi MX1R Series Service Manual

PACD011001C2
3.26

Negative Phase, Open Phase

U1
Remote Controller
Display
„ Power supply negative phase
Supposed Causes
„ Power supply open phase
„ Defect of outdoor PC board A1P
Troubleshooting
Troubleshooting UM Combination "MA1R Series" Using R-407C
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
YES
the power supply terminal
section (X1M) of
the outdoor unit.
NO
Operation
is normal if one place
YES
of power supply line phase is
replaced.
NO
Troubleshooting
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.
(VF053)
523