Transmission Error Between Indoor Unit And Bp Unit - Daikin E-Series Service Manual

SiENBE18-621
6.4

Transmission Error between Indoor Unit and BP Unit

U4
Outdoor Unit
Indication
Method of
The data received from the BP unit in indoor unit-BP unit signal transmission is checked
Malfunction whether it is normal.
Detection
Malfunction When the data sent from the BP unit cannot be received normally, or when the content of the
Decision data is abnormal.
Conditions
" Faulty BP unit PCB.
Supposed
" Faulty indoor unit PCB.
Causes
" Indoor unit-BP unit signal transmission error due to wiring error.
" Indoor unit-BP unit signal transmission error due to disturbed power supply waveform.
" Indoor unit-BP unit signal transmission error due to breaking of wire in the connection wires
Troubleshooting
between the indoor and BP units (wire No. 2).
Troubleshooting for BP Unit
303