Signal Transmission Error (Between Indoor Unit And Outdoor Unit) - Daikin FTKN09NMVJU Service Manual
Inverter pair
wall mounted type
ftk(x)n-n, ftk(x)-n series
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Also See for FTKN09NMVJU:
- Operation manual (92 pages) ,
- Installation manual (39 pages) ,
- Service manual (20 pages)
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SiUS041501E
4.7
Signal Transmission Error (between Indoor Unit and
Outdoor Unit)
U4
Error Code
Method of Error
The data received from the outdoor unit in signal transmission is checked whether it is normal.
Detection
Error Decision
The data sent from the outdoor unit cannot be received normally, or the content of the data is
abnormal.
Conditions
Supposed
Causes
Service Diagnosis
Power supply voltage is not as specified.
Reduction of power supply voltage
Wiring error
Breaking of the connecting wires between the indoor and outdoor units (wire No. 3)
Defective outdoor unit PCB
Short circuit inside the fan motor winding
Defective indoor unit PCB
Disturbed power supply waveform
Troubleshooting
68
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Troubleshooting
