Signal Transmission Error (Between Indoor Unit And Outdoor Unit) - Daikin FTXN09KEVJU Service Manual

Troubleshooting
4.6 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
Malfunction whether it is normal.
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
86
SiUS041111
Service Diagnosis