Daikin VRV II RXYQ8MY1K, Service Manual

Page: 202 / 310

Si39-502A Troubleshooting by Indication on the Remote Controller
Troubleshooting 191
3.35
“
L9
”
Outdoor Unit: Inverter Start up Error
Remote
Controller
Display
L9
Applicable
Models RXYQ8~30MY1K (E), YLK (E)
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. (Inverter secondary current 15.0A)
Supposed
Causes
„
Defect of compressor
„
Pressure differential start
„
Defect of inverter PC board
Troubleshooting
Caution
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
±
10V)
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.
YES
Replace the inverter PC board.
NO
NO
Reset and restart.
NO
The difference
between high and low
pressure when starting
is above
0.2MPa.
YES
YES
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)