U1 Reverse Phase, Open Phase - Daikin RXYQ96PYDN Service Manual

Troubleshooting by Indication on the Remote Controller
U1
3.45 Reverse Phase, Open Phase
U1
Remote
Controller
Display
Applicable RXYQ72P~240PYDN, PTJU
Models REYQ72P~240PYDN, PTJU
Method of
The phase of each phase are detected by reverse phase detection circuit and right phase or
Malfunction reverse phase are judged.
Detection
Malfunction
When a significant phase difference is made between phases.
Decision
Conditions
Supposed
Causes
Troubleshooting
414
Power supply reverse phase
Power supply open phase
Defect of outdoor PC board (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
SiUS34-801A_b
Fix the open phase. Requires
inspection of field power supply
section.
Reverse phase
Counter measure of the problem is
completed by phase replacement.
Replace outdoor unit PC board
(A1P).
• With single systems, replace the
control PC board 1 (A1P) or the
control PC board 3 (A3P).
• With multi systems, replace the
main PC board (A1P).
(V2820)
Troubleshooting