Troubleshooting
4.8
Signal Transmission Error (between Indoor Unit and
Outdoor Unit)
U4
Remote
Controller
Display
Method of
The data received from the outdoor unit in indoor unit-outdoor unit signal transmission is checked
whether it is normal.
Malfunction
Detection
Malfunction
The data sent from the outdoor unit cannot be received normally, or the content of the data is
Decision
abnormal.
Conditions
Wiring error
Supposed
Breaking of the connection wires between the indoor and outdoor units (wire No. 3)
Causes
Defective outdoor unit PCB
Defective indoor unit PCB
Disturbed power supply waveform
109
SiUS091133
Service Diagnosis