SiUS181631EA Troubleshooting for Outdoor Unit
Troubleshooting 247
7.19 Inverter Compressor Abnormality
Error Code
L5
Method of Error
Detection
The error is detected from current flowing in the power transistor.
Error 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
Note: Higher voltage than actual is displayed when the inverter output voltage is checked by multimeter.
Disconnect the connection
between the compressor
and the main PCB. Turn the
power transistor check
mode setting ON in setting
mode 2.
Is the
compressor's coil
disconnected or the
insulation is
defective?
There is
instantaneous power
failure.
Is the 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.
(R22101)
Replace the compressor.
YES
Correct power supply.
NO
Replace the main PCB
(A1P).
NO
NO
YES
YES
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
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