U1 " Reverse Phase, Open Phase - Daikin RQYQ140-180PY1 Service Manual

SiBE341001
U1
2.30 " " Reverse Phase, Open Phase
U1
Remote
Controller
Display
Applicable RQYQ-PY1
Models RQEQ-PY1
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 power supply is reverse phase, or T phase is open phase.
Decision
Conditions
Supposed
Causes
Troubleshooting
Troubleshooting
Power supply reverse phase
T phase open phase
Defect of outdoor 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
Fix the open phase. Requires
inspection of field power supply
section.
Reverse phase Reverse phase
Counter measure of the problem is Counter measure of the problem is
completed by phase replacement. completed by phase replacement.
Replace the outdoor unit PCB
(A1P).
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