Troubleshooting for Outdoor Unit SiBE18-821_C
404 Troubleshooting
7.19 Inverter Compressor Abnormality
Remote
Controller
Display
L5
Method of
Malfunction
Detection
The error 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
îš„
Defective compressor coil (disconnected, defective insulation)
îš„
Compressor start-up malfunction (mechanical lock)
îš„
Defective main PCB (A1P)
Troubleshooting
Higher voltage than actual is displayed when the inverter output voltage is checked by tester.
Disconnect the connection
between the compressor
and the main PCB. Make
the power transistor check
mode setting ON by service
mode.
Is the
compressor's coil
disconnected or the
insulation is
defective?
There is
instantaneous power
drop.
Is inverter
output voltage
balanced? (Normal if
within ±5V. Must be
measured when
frequency is
stable.)
Inspect the compressor
according to the diagnosis
procedure for odd noises,
vibration and operating
status of the compressor.
(R13037)
Replace the compressor.
YES
Correct power supply.
YES
Replace the main PCB
(A1P).
Not balanced
NO
Balanced
NO
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
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