Header tank overfowing due to hot water flowing in?

follow your cold feed to where it joins the heating pipework in airing cupboard thats the most common place for a blockage.


try turning the pump speed down to min.

also you can find a drain cock on a rad, secure your ball valve.
and drain the system if the system drains and tank still full you have located your blockage.

hi-spec plumbing & heating
June 2008

Thanks Hi -Spec.
Tried your test and water still keeps flowing into small header tank. Dont understand where blockage to cold feed could be and why any water would run if no new water was entering system?

Paul
June 2008

no sounds like a blockage in the cold feed.

shut the gate in the airing cupboard that feeds the cylinder from the large cws tank in loft.
does it stop. the water coming out of the vent pipe ?
if not you have a blockage.

hi-spec plumbing & heating
June 2008