L9" Outdoor Unit: Inverter Start Up Error - Daikin VRVIII-S Service Manual

SiENBE34-703

3.34 "L9" Outdoor Unit: Inverter Start up Error

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