Si18-525B Troubleshooting for Outdoor Unit
Troubleshooting 381
7.16 Inverter Compressor Abnormal
Remote
Controller
Display
L5
Applicable
Models
AII outdoor unit models
Method of
Malfunction
Detection
Malfunction is detected from current flowing in the power transistor.
Malfunction
Decision
Conditions
When an excessive current flows in the power transistor.
(Instantaneous overcurrent also causes activation.)
Supposed
Causes
Defect of compressor coil (disconnected, defective insulation)
Compressor start-up malfunction (mechanical lock)
Defect of inverter PCB
Troubleshooting
Higher voltage than actual is displayed when the inverter output voltage is checked by tester.
(V2812)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Compressor inspection
Inverter
output
voltage check
Inverter output
voltage is not balanced.
(Normal if within ±5V Must
be measured when
frequency
is stable.
Replace the compressor.
Compressor inspection
Inspect according to the diagnosis
procedure for odd noises, vibration
and operating status of the
compressor.
NO
Replace the inverter unit.
YES
YES
Correct power supply.
YES
The compressor's
coil is disconnected or the
insulation is
defective.
NO
NO
Disconnect the connection
between the compressor and
inverter. Make the power
transistor check mode setting
ON by service mode.
There is
instantenious power
drop.
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