Signal Transmission Error (Between Indoor And Outdoor Units) - Daikin CTXS09GVJU Service Manual

Troubleshooting
5.7 Signal Transmission Error (between Indoor and Outdoor
Units)
U4
Remote
Controller
Display
Method of The signal transmission data from the outdoor unit to the indoor unit is checked for normal
Malfunction operation.
Detection
Malfunction
When the data sent from the outdoor unit cannot be received normally, or when the content of the
data is abnormal.
Decision
Conditions
Supposed
Causes
122
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. 3).
SiUS12-814
Service Diagnosis