Signal Transmission Error (Between Indoor Unit And Outdoor Unit) - Daikin FTXZ25NV1B Service Manual
Ftxz-n series inverter pair wall mounted type
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Also See for FTXZ25NV1B:
- Operation manual (48 pages) ,
- Service manual (36 pages) ,
- Installation manual (23 pages)
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Troubleshooting
2.35 Signal Transmission Error (Between Indoor Unit and
Outdoor Unit)
U4
Error Code
Method of Error
The data sent from the outdoor unit is checked for problem.
Detection
Error Decision
The data sent from the outdoor unit cannot be received without error, or the disable status of
signal transmission continues for 15 seconds.
Conditions
Supposed
Causes
171
Wiring error
Breaking of the connecting wires between the indoor unit and the outdoor unit
Improper insulation of the connecting wires and earth
Wiring length exceeds the specified range
Defective outdoor unit PCB
Defective indoor unit PCB
Layer short inside the fan motor winding
SiMT041311E
Service Diagnosis
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