Troubleshooting for Outdoor Unit Si18-525B
382 Troubleshooting
7.17 Inverter Current Abnormal
Remote
Controller
Display
L8
Applicable
Models
AII outdoor unit models
Method of
Malfunction
Detection
Malfunction is detected by current flowing in the power transistor.
Malfunction
Decision
Conditions
When overload in the compressor is detected.
Supposed
Causes
Compressor overload
Compressor coil disconnected
Defect of inverter PCB
Troubleshooting
(Q0437)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Output current check
Inverter
output
voltage check
Inverter output voltage
is not balanced
(Normal if within ±5V). Must
be measured
when
frequency
is stable.
Compressor overload
Inspection of the compressor and
refrigerant system is required.
Compressor inspection
Inspect according to the diagnosis
procedure for odd noises, vibration
and operating status of the
compressor.
NO
Replace the inverter PCB.
YES
NO
Reset and restart.
NO
The secondary
current of the inverter is
higher than 24.9A
for each phase.
Replace the compressor.
NO
YES
Compressor
inspection The
compressor's coil is
disconnected.
YES
YES
Disconnect the the connection
between the compressor and
inverter. Make the power
transistor check mode setting
ON by service mode.
After turning
on again, "L8" blinks
again.
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