Search results

Our heating system is working perfectly, except that the Vaillant boiler has to modulate right down when only the underfloor heating manifold is being supplied. It needs water at 35°.This means the boiler is on for ages. It is annoyingly loud even at the minimum 4kW. I have suggested a revised...

Can anyone identify the source of an intermittent loud droning noise from our Vaillant EcoTec Plus 612 boiler? Vaillant’s engineer came out but it didn’t happen that day! He did check the boiler through and found no faults. Before I ask a local repair man to have a look, I wonder if any of you...

We had a new Vaillant EcoTec Plus 612 system boiler installed in February. Occasionally, about once per week, we have experienced a very loud droning resonance in the pipework. This is savage enough to be heard through the house and felt on the pipes and boiler casing. It appears to be caused...

Hello, today I cleaned the condensate trap of our EcoTec Plus 618 which is 11 years old. The plastic is discoloured orange and there was about 4mm of black rust granules at the bottom of it. Does this mean the burner chamber (or whatever it is called) is rusting? Does it indicate I need to...

My Vaillant ecoTEC plus 618 display is always illuminated - previously it would go dark until I turned one of the temperature setting knobs. Not only that but now the temperature shown is flickering irregularly around the preset temperature (70°) and also flashing back to the outgoing...