Troubleshooting Si33-105
182 Troubleshooting R407C PLUS Series Heat Recovery System
3.26 Reverse Phase, Open Phase
Remote
Controller
Display
U1
Supposed
Causes
!
Power supply reverse 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 (X1M) 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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