SiBE12-908 Troubleshooting
Service Diagnosis 160
2.34 Signal Transmission Error on Outdoor Unit PCB
Remote
Controller Display
U7
Method of
Malfunction
Detection
Communication error between microcomputer mounted on the main body and inverter.
Malfunction
Decision
Conditions
When the data sent from the microcomputer of the inverter can not be received successively
for 9 seconds, the unit shuts down.
Fault counter is reset when the data from the microcomputer of the inverter can be
successfully received.
Supposed
Causes
Defective outdoor unit PCB
Disconnection or breakage of harness between PCBs
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