SiUS281811EA Troubleshooting by Error Codes
Part 6 Service Diagnosis 267
4.39 PCB (for Inverter Compressor) Abnormality
Error Code L1
Applicable
Models
All outdoor units
Method of Error
Detection
Error is detected based on the current value during waveform output before starting
compressor.
Error is detected based on the value from current sensor during synchronous operation when
starting the unit.
Error Decision
Conditions
Overcurrent (OCP) flows during waveform output.
Error of current sensor during synchronous operation.
IPM failure.
Supposed
Causes
IPM failure
Current sensor failure
Drive circuit failure
Troubleshooting
Replace the outdoor main PCB
(A1P).
YES
NO
It is supposed that the error results
from external causes other than
failures (e.g. exogenous noises or
thunder).
Turn off the power. Then,
turn on the power again.
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Caution
Does the power
supply normally come
back on?
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