SiUS331604E Troubleshooting by Error Code
Service Diagnosis 184
4.32 Inverter Compressor Instantaneous Overcurrent
Error Code L5
Applicable
Models
All outdoor units
Method of Error
Detection
Error is detected from current flowing in the power transistor.
Error Decision
Conditions
An excessive current flows in the power transistor.
Supposed
Causes
Defective compressor coil (disconnected, defective insulation)
Defective compressor startup (mechanical lock)
Defective PCB
Troubleshooting
Refer to page 225.
Replace the outdoor main
PCB (A1P).
YES
YES
NO
NO
YES
NO
NO
Check if the power
transistor is
normal.
Failure occurs
again after restarting the
unit.
YES
(
(
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Insulation
resistance of
the compressor
is 100 kΩ or
below.
Compressor coils are
disconnected.
Continue the operation.
Momentary power failure
is possible.
Replace the inverter
compressor.
Replace the inverter
compressor.
CHECK 4
Replace the outdoor main PCB.
NO
YES
Failure occurs
again after restarting the
unit.
Continue the operation.
Replace the compressor.
CHECK 4
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