Daikin VRV II-Q RQYQ8-48PY1B Service Manual page 145

SiBE341027
Troubleshooting
Individual system
∗
Service Diagnosis
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Turn OFF the power supply
once, and then check the
compressor lead wires.
Do the lead wires have
any disconnection, broken
wire, short circuit, or
Turn ON the power supply
again.
Does the power
supply normally come
Is the individual
YES
system applied to the
outdoor unit?
While in monitor mode, check
whether the system is right-hand
(service monitor PCB 1) or left-
hand (service monitor PCB 3).
∗
CHECK 4
Check if the power
transistor is
normal.
YES
∗
CHECK 4
Check if the power
transistor of the
fan driver is
normal.
YES
CHECK 4 : Referring to the information on P.182.
YES
ground fault?
NO
YES
back ON?
NO
NO
Multi system
While in monitor mode,
check the outdoor unit
concerned.
NO
Check if insulation
resistance of the
compressor is 100k Ω
and above.
YES
NO
Troubleshooting by Remote Controller
Replace the lead wires.
It is supposed that the error results
from external causes other than
failures (e.g. exogenous noises or
thunder).
NO
Replace the compressor and
compressor inverter PCB (A4P) at
the same time.
Replace the inverter PCB (A4P).
Replace the compressor inverter
PCB (A4P) and fan inverter PCB
(A5P).
Replace the inverter PCB (A3P).
135