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Troubleshooting SiUS091133
111 Service Diagnosis
4.9 Signal Transmission Error on Outdoor Unit PCB
(24/30/36 Class Only)
Remote
Controller
Display
U7
Method of
Malfunction
Detection
Communication error between microcomputer mounted on the main microcomputer and PM1.
Malfunction
Decision
Conditions
The abnormality is determined when the data sent from the PM1 can not be received for 9
seconds.
The error counter is reset when the data from the PM1 can be successfully received.
Supposed
Causes
Defective outdoor unit PCB
Troubleshooting
(R7185)
Caution
NO
YES
Turn off the power and turn it on
again.
Error again?
Replace the outdoor unit
PCB.
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
The cause can be an
external factor other than
the malfunction.
Observe the operating
condition in long term.
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