F.196
The unit has detected significant overvoltage in the power supply.
Vaillant ecoTEC Plus Combi
Possible cause
Overvoltage in the power supply
Measure
If the mains voltage is not correct, contact the energy supply company.
Possible cause
Pump defective
Measure
If the mains voltage is correct, replace the pump (voltage measurement via pump electronics).
Possible cause
Fault in the electrical connection for the pump
Measure
Check the wiring harness between the PCB and pump, including all plug connections.