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A 2 year old (just out of warranty!) boiler has been throwing E125 since the day (literally) my Mother moved into her newly-built house. The fault has been raised with her Home builder who have called in Potterton engineers three times now as well as numerous visits by their own snaggers. Over...

Update: the electrode replaced in Nov 2010 has broken down again. Looks like these things need replacing quite frequently.

As I said above, that was tried before the F&E tank was raised but the plumber who did it was skeptical and didn't really "go for it" with the height. In hindsight, increasing the head by a metre or so damped the surge a bit and combined with the higher inverted U that was retained from the...

As a topical update to this thread I finally got round to replacing all the 22mm pipe in the vent T-off with 28mmm and the surging stopped. Some here may be surprised, some not. I wasn't - just very relieved (mostly of cash) .

Rats - I forgot I started a dedicated topic CH Sytem vent pipe diameter to discuss this. The thread wer're in now was all about the F&E tank shenanigans that happened after one particularly abortive attempt at a remedy. The vent thread is still relevant despite being started a couple of years...

You must have missed my reply to you a couple of posts above...:D plenty of head: two-storey house, boiler on ground F&E in loft - now on platform 1.5m high after one early attempt to fix pump over. It helped a little but didn't stop it under all circumstances. tryitandsee - I think the pump...

OK newgas :D I know Inertia is a big issue in large-scale industrial pumping systems where fluids sometimes have the kinetic energy of express trains! The fluid dynamics inside your average CH system are no less complicated though. And a lot of good problem solving has to do with thought...

No, there's less tendency for the water to climb up the vent we way we have it: (also see photo half way down page one of thread) [code:1] Vent Feed Pump || || | | || || | | || || | | || =======| | || | | ============| | | |...

I'm glad to see the effects of air traps being discussed. I know there's a temptation to view hydraulic systems as "perfect" transmission systems but that's not the case in practice. Like you say Tony, in our case with 16 (mostly twin panel) rads, there's still always going to be a significant...

Except the "solution" is still in dispute :wink: As a practical matter, there is no doubt here that changing the vent from 22mm to 28mm (not a huge difference in CSA) has, for what ever reason, eliminated pumping over (or the same effects as pump over). That is to say that the level in the...

Thanks for the tip - I did as you suggested and they advised me that the Supply of Goods & Services Act 1982 is applicable to the repair work carried out last December. As I thought, it's simply not right to tell me that repairs under warranty carry no warranty of their own. Now I'm looking...

Mixed feelings. Glad to get help with the expenses, but you can't help wondering how they go about their business. I would much rather it was done as a grant for which you could contract your own installer and choose your own system.

Update (seeing as I've been posting again about yet another problem with this installation). As per "theory" above - re-doing vent pipe all in 28mm totally eliminated the problem last year. Maybe this might help solve some of the many pumping over mysteries I keep reading about :roll:

Well, the boiler was installed under the Warm Front initiative. Its servicing and repair was therefore carried out by Warm Sure. They appointed the installers but we've seen several different contractors come in for various remedial work. I contacted Warm Sure about the latest breakdown but they...

Interesting, PEDANTICVINDICTIVEMAN. Really cheap & nasty bit of junk. The ceramic isn't able to hold up to the 10~20KV needed to jump the 4mm gap. I added a diagram showing how it fails in my original thread.

Looks like mitch66 was right when he mentioned the "flux capacitor". That orange glow I was describing is def. a failed electrode (dielectric flux travelling through a capacitor :mrgreen:) On the phone Glowworm tech admitted there were problems with the electrode assemblies used in...

Thinks "Swiss Tony" - Lucky me, mines like a shapely woman :) Just (another) new electrode is going to fix this - now I can see where the electrode is arcing through the ceramic to the metal base. "Made in Italy" is stamped on the part. Maybe a clue as to why the spark goes off prematurely?

In yet another thread about explosive ignition in Glow-worm Flexicom's I was very interested to read this: One week out of the two-year warranty and I see this. Anyone got serial numbers or do I have to pay a 60p/minute ransom to find out if our boiler needs the modified electrode or not...