Troubleshooting Si10-417
142 Service Diagnosis
5.3.9 Signal Transmission Error (between Indoor
and Outdoor Units)
Remote
Controller
Display
U4
Method of
Malfunction
Detection
The data received from the outdoor unit in indoor unit-
outdoor unit signal transmission is checked whether it is
normal.
Malfunction
Decision
Conditions
When the data sent from the outdoor unit cannot be
received normally, or when the content of the data is
abnormal.
Supposed
Causes
Faulty outdoor unit PCB.
Faulty indoor unit PCB.
Indoor unit-outdoor unit signal transmission error due
to wiring error.
Indoor unit-outdoor unit signal transmission error due
to disturbed power supply waveform.
Indoor unit-outdoor unit signal transmission error due
to breaking of wire in the connection wires between
the indoor and outdoor units (wire No. 2).
Si10-417.fm Page 142 Wednesday, September 22, 2004 6:38 PM
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