Reverse Phase, Open Phase; U1" Reverse Phase, Open Phase - Daikin VRV III REYQ8PY1B Service Manual

Troubleshooting by Indication on the Remote Controller
U1
3.45 " "

Reverse Phase, Open Phase

U1
Remote
Controller
Display
Applicable REYQ8P~48P
Models
Method of The phase of each phase are detected by reverse phase detection circuit and right phase or
reverse phase are judged.
Malfunction
Detection
Malfunction When a significant phase difference is made between phases.
Decision
Conditions
Supposed
Causes
Troubleshooting
328
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
SiBE37-701
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 individual 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