U1" Reverse Phase, Open Phase - Daikin VRV II RXYQ5MY1B Service Manual

Troubleshooting by Indication on the Remote Controller

2.40 "U1" Reverse Phase, Open Phase

U1
Remote
Controller
Display
Applicable H3 phase outdoor unit only
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
Decision
Conditions
Supposed
Causes
Troubleshooting
218
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
SiE39-404
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