Open vent heating pumping over

Tom Pickles · 2014-01-26T17:41:08+00:00

My heating's been pumping over for a while now, spilling over the overflow from my header tank. I can't seem to get to the bottom of the problem. I've extended the height of the open vent which is now two feed above the t op of the header tank. I have also bent the arm of the float valve so that the water level in the header tank is about five inches high, but it still pumps over and out of the overflow. I recently put fernox F3 through the system, flushed it all out and re-trea ted. I also descaled the boiler using fernox DS40 as part of the same job. I have read that the aerjec air separator things can get blocked and cause pumping over, but I'm not sure how I would re-pipe it if I removed it, or p erhaps it isn't a problem?! Here's a photo I took of my pipe setup in the airing cupboard (ignore the l eaky hot tank, that was quickly replaced): The pump flows from top to bottom. Any ideas guys? Thanks, Tom

Jan 26, 2014 26 Replies

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tabbypurr 8 years ago

Why do hoh only get idiots posting? Could it be the sensible ones see the d ate & walk away?

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John Rumm 8 years ago

Dunno... If you want a web portal to usenet, then as they go its not too bad. It even allows proper quoting if you know how to drive it. Perhaps its all too difficult for the facebook generation!

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Vir Campestris 8 years ago

I'm not an anything to do with heating. But I am a bit surprised that you agree with him that the black stuff is hydrogen deposited as sludge. I thought it was iron (II) oxide...

Andy

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John Rumm 8 years ago

Sorry, was > I thought it was iron (II) oxide...

Indeed it is.

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Roger Hayter 8 years ago

Apparently, meaning I just looked it up, magnetite, which contains Fe(II) and Fe(III) is more stable than Fe(II)0 (which exists as Fe(OH)2 in water) in reducing conditions.

Just as a matter of interest!

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Fredxx 8 years ago

The kindest thing would be to add a criteria of "Re:" in the title.

Thankfully HOH replies are few and far between, perhaps an indication of the traffic they get!

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Blippetyblop 6 years ago

This is a great and helpful reference post in context. Thanks for posting.

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