SiBE04-809 Troubleshooting
Service Diagnosis 115
4.27 Signal Transmission Error on Outdoor Unit PCB
Remote
Controller
Display
U7
Method of
Malfunction
Detection
Communication error between microcomputer mounted on the main microcomputer and PM1.
Malfunction
Decision
Conditions
When the data sent from the PM1 can not be received successively for 9 sec.
The abnormality is determined if the above fault conditions occurs once.
Fault counter is reset when the data from the PM1 can be successfully received.
Supposed
Causes
Defective outdoor unit PCB
Troubleshooting
(R7185)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
NO
YES
Turn off the power and turn it on
again.
Error again?
Replace the outdoor unit
PCB.
Monitor in long term.
The cause can be an
external factor other than
the malfunction.
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