Daikin VRVIII-S, Service Manual

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SiENBE34-703 Troubleshooting by Indication on the remote control
Troubleshooting 161
3.34 “
L9
” Outdoor Unit: Inverter Start up Error
remote control
Display
L9
Applicable
Models RXYSQ4~6P
Method of
Malfunction
Detection Malfunction is detected from current flowing in the power transistor.
Malfunction
Decision
Conditions When overload in the compressor is detected during startup
Supposed
Causes ! Defect of compressor
! Pressure differential start
!
Defect of outdoor unit PC board (A2P)
Troubleshooting
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Inverter
output voltage
check Inverter
output voltage is not
balanced.
(Normal if within
±
5V)
Must be measured when
frequency is stable.
Unsatisfactory pressure
equalization
Check refrigerant system.
Compressor inspection
Inspect according to the diagnosis
procedure for odd noises, vibration
and operating status of the
compressor.
Replace the inverter PC board
assy (A2P).
Reset and restart.
The difference
between high and
low pressure when
starting is above
0.2MPa.
Disconnect the connection
between the compressor and
inverter. Make the power
transistor check mode ON by
service mode.
After turning on again,
"L9" blinks again.
(V2814)
Caution
YES
YES
YES
NO
NO
NO