can you help me i do not know the exact model no. of my boiler but on the labels it says VCW GB 221,240,280H.It has been losing water pressure.when the heating is on the pressure goes up to 3bar approx. however when the heating switches of the needle on the gauge starts to come back down, to less than 1 bar in approx. 3hrs. with the heating off the pressure still comes down but takes longer.Can you please advise and is this dangerous.Also does anyone know how old this boiler is and are spares easily available.when i moved in to my home in 1998 i was told the boiler was only 8 months old

carterb, November 2008

I have the same problem and have a Vaillant Turbomax 424e.

You may wish to check the valves on your radiators are open as this can cause this problem.

I have done this and it has fixed the problem.

However the warmstart facility is now not working properly but this is a separate issue !!

Phil, November 2008