Daikin VRV II RXYQ5MATL, Service Manual, Page: 226 / 331

Si39-504 Troubleshooting by Indication on the Remote Controller
Troubleshooting 215
3.40
“
U1
”
Reverse Phase, Open Phase
Remote
Controller
Display
U1
Applicable
Models 3 phase outdoor unit only
Method of
Malfunction
Detection The phase of each phase are detected by reverse phase detection circuit and right phase or
reverse phase are judged.
Malfunction
Decision
Conditions When a significant phase difference is made between phases.
Supposed
Causes
„
Power supply reverse phase
„
Power supply open phase
„
Defect of outdoor PC board (A1P)
Troubleshooting
(V2820)
Operation
is normal if one
place of power supply
line phase is
replaced.
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).
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.