F.087
The ignition transformer is not connected to the PCB.
Vaillant ecoTEC Plus System
Possible cause
Fault in the electrical connection for the ignition transformer
Measure
Check the wiring harness between the PCB and ignition transformer, including all plug connections.
Possible cause
Defective ignition transformer
Measure
Check that the ignition transformer is working correctly and, if required, replace it.
This code also applies to: