Specifications

SiUS12-928_A Troubleshooting
Service Diagnosis 110
5.7 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
The data sent from the outdoor unit cannot be received normally, or the content of the data is
abnormal.
Supposed
Causes
 Defective outdoor unit PCB
 Defective indoor unit PCB
 Wiring error
 Disturbed power supply waveform
 Breaking of the connection wires between the indoor and outdoor units (wire No. 3)