F.707
No communication is possible between the display and the PCB.
Vaillant ecoTEC Plus Combi
Possible cause
Communication between the display and the PCB is interrupted
Measure
1. Check the connection between the display and the PCB.
2. If required, replace the cable between the display and the PCB.
3. If required, replace the display or the PCB.
This code also applies to: