Hi I have a central heating system that is a Baxi boiler behind fireplace, a hot water tank upstairs and a cold water and expantion tank in the loft.
My problem is this when the room thermostat goes off, the central heating bangs like there is air traped in it, then it sends hot water up to the expantion tank, making it constantly drip out of the overflow pipe from the expantion tank. I have bled the rads and the pump which help reduce the problem, however does not stop it. It gradually just gets worse with time. Any ideas or suggestions. Or quotes to fix many thanks.
My problem is this when the room thermostat goes off, the central heating bangs like there is air traped in it, then it sends hot water up to the expantion tank, making it constantly drip out of the overflow pipe from the expantion tank. I have bled the rads and the pump which help reduce the problem, however does not stop it. It gradually just gets worse with time. Any ideas or suggestions. Or quotes to fix many thanks.