Si18-525B Troubleshooting for Outdoor Unit
Troubleshooting 383
7.18 Inverter Start up Error
Remote
Controller
Display
L9
Applicable
Models
AII outdoor unit models
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 inverter PCB
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 ±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.
YES
Replace the inverter PCB
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.
(Q0438)
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