Reverse Phase, Open Phase - Daikin VRV II-Q RQYQ8-48PY1B Service Manual

SiBE341027

2.30 Reverse Phase, Open Phase

U1
Remote
Controller
Display
Applicable RQYQ-PY1B
Models
Method of Error The phase of each phase are detected by reverse phase detection circuit and right phase or
reverse phase are judged.
Detection
Error Decision When a power supply is reverse phase, or T phase is open phase.
Conditions
Supposed
Causes
Troubleshooting
Service Diagnosis
Power supply reverse phase
T phase open phase
Defective outdoor unit PCB (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 (T phase) terminal
section (X1M) of the
outdoor unit.
NO
Operation is
normal if one place
of power supply
line phase is
replaced.
NO
YES
YES
Troubleshooting by Remote Controller
Rectify the open phase.
Requires inspection of field
power supply section.
Reverse phase
Countermeasure of the problem is
completed by phase replacement.
Replace the outdoor unit PCB
(A1P).
151