U1" Outdoor Unit: Reverse Phase, Open Phase; Reverse Phase, Open Phase - Daikin RXYQ72 Serivce Manual

Troubleshooting by Indication on the Remote Controller
2.42 "U1" Outdoor Unit:
U1
Remote
Controller
Display
Applicable RXYQ72M, 96M
Models
Method of Detection is based on the voltage in main circuit capacitor for inverter and supply voltage.
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
174

Reverse Phase, Open Phase

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
SiUS39-601
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).
(V2820)
Troubleshooting