F.324
The electrical connection to the pump has been interrupted.
Vaillant ecoTEC Plus Combi
Possible cause
The cable to the pump is defective
Measure
Check the cable for the 230 V power supply to the pump and, if required, replace the cable for the 230 V power supply.
Possible cause
The pump is defective.
Measure
Check and, if required, replace the pump.