Troubleshooting for Outdoor Unit SiAU18-715
380 Troubleshooting
7.21 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 outdoor unit PCB (A1P)
Troubleshooting
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Disconnect the connection
between the compressor
and inverter. Make the
power transistor check
mode ON by service mode.
The
difference
between high and low
pressure when starting is
above 0.2MPa.
After turning
on again, "L9" blinks
again.
Inverter
output
voltage check
Inverter output voltage
is not balanced. (Normal if
within ±5V) Must be
measured when
frequency is
stable.
Replace outdoor unit PC
board (A1P).
NO
Unsatisfactory pressure
equalization
Check refrigerant system.
NO
YES
YES
Compressor inspection
Inspect according to the
diagnosis procedure for
odd noises, vibration and
operating status of the
compressor.
(Q0570)
Reset and restart.
NO
YES
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