Troubleshooting by Error Codes SiUS281811EA
272 Part 6 Service Diagnosis
4.44 Transmission Error (Between Microcomputers on the
Outdoor Main PCB)
Error Code LC
Applicable
Models
All outdoor units
Method of Error
Detection
Transmission conditions between microcomputers on the outdoor main PCB are tested via
microcomputer.
Error Decision
Conditions
No normal transmission after a certain period of time
Supposed
Causes
Connection error between microcomputers on the outdoor main PCB
Defective outdoor main PCB (Transmission part)
Defective noise filter
External factors (Noise, etc.)
Defective inverter compressor
Defective fan motor
Troubleshooting
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
YES
NO
Replace the outdoor
main PCB.
Replace the inverter
compressor.
YES
YES
NO
NO
YES
Replace the fan motor.
No LC error. Check
the error code again.
NO
Is the
outdoor main PCB
damaged?
Inverter
compressor insulation
resistance is less than
100 kΩ.
Fan motor
insulation resistance is less
than 1 M
Ω
.
Normal monitoring
light (green) of outdoor main PCB
(A1P) blinks.
YES
Replace the outdoor
main PCB (A1P).
Normal
monitoring light
(green) of main PCB
blinks.
(
)
Keep operating.
Possibly because of
sudden power failure, etc.
NO
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