Daikin VRV II-Q RQYQ8-48PY1B Service Manual page 163

SiBE341027
Troubleshooting
Remove and insert the
connectors shown below.
Service Diagnosis
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
Check the condition of the
power supply.
Check if power supply
voltage is 380 to 415V.
Check if there is open
phase or wrong wiring.
Check if power supply
voltage side unbalance is
with in 6V.
There are
problems on the
condition of power
supply described
above.
NO
The insulation
resistance of
compressor is not
more 100kΩ.
NO
The insulation
resistance of fan
motor is not more
1MΩ.
NO
CHECK 4
Is the power transistor
normal?
YES
X4A (A4P) ↔ X16A (A2P)
X6A (A4P) ↔ X28A (A1P)
Has the inverter
PCB caused
damage?
NO
A
YES
YES
YES
NO
YES
Troubleshooting by Remote Controller
Correct the problem.
Replace the compressor.
Replace the fan motor.
If the fan motor is badly
damaged, replace the
inverter PCB (A4P).
Replace the inverter PCB (A4P)
Replace the inverter PCB (A4P).
If the inverter PCB is badly
damaged, compressor and
fan motor are likely to get
faulty.
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