L9" Outdoor Unit: Inverter Start Up Error - Daikin R-410A Service Manual

SiBE39-402A

4.31 "L9" Outdoor Unit: Inverter Start up Error

L9
Remote
Controller
Display
Applicable
AII outdoor unit models
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
! Defect of compressor
Supposed
! Pressure differential start
Causes
! Defect of inverter PC board
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 Controller
NO
NO
NO
Unsatisfactory pressure
equalization
Check refrigerant system.
Replace the inverter PC board
Reset and restart.
Compressor inspection
Inspect according to the diagnosis
procedure for odd noises, vibration
and operating status of the
compressor.
(V2814)
145