SiAF332111E Troubleshooting by Error Code
Part 6 Service Diagnosis 281
5.47 Transmission Error between Microcomputers on
Outdoor Unit Main PCB
Applicable
Models
RXQ4/5AR, RXMQ6AR
Error Code LC
Method of Error
Detection
Check for the transmission conditions between microcomputers on the outdoor unit main PCB
using a microcomputer.
Error Decision
Conditions
Normal transmission is disabled for a given period of time or more.
Supposed
Causes
Connection error between microcomputers on the outdoor unit main PCB
Defective outdoor unit main PCB (transmission block)
Defective noise filter
External factors (e.g. noise)
Defective compressor
Defective fan motor
Troubleshooting RXQ4/5AR
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
YES
NO
Replace the outdoor
unit main PCB (A1P).
Replace the compressor
(M1C).
YES
YES
NO
NO
Replace the fan motor
(M1F).
Replace the outdoor
unit main PCB (A1P).
NO
Is the outdoor
unit main PCB
damaged?
Compressor
insulation resistance is
less than
100 k.
Fan motor
insulation resistance is
less than 1 M
.
Normal monitoring
light (green) of outdoor unit main
PCB (A1P) blinks.
YES
(
)
Keep operating.
Possibly because of
sudden power failure, etc.
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