vent pipe constantly running

[markbrum]

Hi,

A couple of months ago I noticed that the vent pipe which runs into my loft tank had started continually running hot water whilst the system was running.

I have a Grundfos 15-50x18 pump which has 3 settings, at the time the pump was set to 2. When I turned it down to 1 the water ran out the vent pipe faster and when I turned it up to level 3 it stopped running – so I left it there and it seemed fine for a while.

Now it has started running again even on level 3. I have had the silver disc off the front of the pump and the spindle seems to be turning fine. I have been told that this is a bleed screw but it just slowly drips water when opened.

Generally the water and central heating seems to work otherwise, though I have occasionally had issues with the downstairs radiators not warming up, although that did seem to cure itself.

The boiler is a Glowworm MkII.

Does anyone know what might be the problem?

Thanks v much.

Mark.

 

[twgas]

probably a blockage near where the cold feed from header tank joins system, this pumping over will cause serious corrosion and sludge build up. flushing and cleaning strongly recommended

 

[bengasman]

read FAQs

 

[Softus]

When I turned it down to 1 the water ran out the vent pipe faster and when I turned it up to level 3 it stopped running.

That doesn't make sense - I think you'll find that you've got those two settings the wrong way around.

I have occasionally had issues with the downstairs radiators not warming up, although that did seem to cure itself.

I think you're being a bit naive - if the problem was intermittent blockages then the debris is still in the system.

As bengasman has pointed out, your problem is a very common one and you'll find lots of information in the Wiki and FAQs, but when you've read it then come back here if you need specific guidance.

 

[markbrum]

ok thanks everyone for your answers i will look at the faqs