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It is a statistical certainty. Unless Maxwell's demon has taken up residence in your boiler.

Sorry, left the link out. Post now edited to include URL. John

I think that the fact that you ask this question indicates that you don't understand how the boiler works. The same (sealed system) water is used to indirectly heat both the DHW and the CH. The same pump is used to push the sealed system water through the CH heat exchanger or the DHW heat...

You might want to take a look at my thread here: http://www.diynot.com/forums/plumbing/faulty-diverter-valve-on-potterton-gold-combi-he28.406763/ You could have a similar situation. On the other hand, I could be suffering from "When all you have is a hammer, everything looks like a...

Only just got round to doing this, what with being on holiday and various other committments. Anyway, I bought a replacement HE to be on the safe side(wife and daughter have proper jobs, and they'll not be happy if they can't have a hot shower). Finally managed to wiggle the old one out, cutting...

Thanks. I'll take another look, and see if I think I'm competent. Make sure I've got the necessary spanners... What's a good cleaner to use?

Thanks for the compliment, although I have to say that I have the advantage of having a diverter valve repair cartridge on my desk here, which I bought on eBay for 14.99. Little did I know that it only fits the slightly later Gold Combi HE28A, not the HE28. So I've had plenty of opportunity to...

Just going on what the service manual says: "14.20 Plate Heat Exchanger (Fig. 98) 1. Drain the boiler primary circuit and remove the gas valve as described in section 14.23. 2. While supporting the heat exchanger undo the screws securing it to the brass manifolds. 3. Withdraw the heat...

Except that would involve removing the gas valve, which I am not qualified or equipped to do...

Thanks for the reply. I think the banging is probably kettling due to a partially blocked plate HE. Yes, the heating flow does get hot, but my real question is this: Because both parts of the diverter valve are sprung, is it possible that a partially blocked plate HE would cause a build up of...

Gosh. Does nobody have an opinion on this?

My Potterton Gold Combi HE28 is misbehaving. I have it set to hot water only, but when I turn on a tap it makes a banging noise and the radiators start to get hot. I do get some hot water from the taps, but it's not right. Could it be a faulty diverter valve? Or could it be that the plate HE is...

I would like to fit TRVs at home. I am usually the only person at home during the day, and I work in a small upstairs room that also houses the combi-boiler, but sometimes my wife works from home, or one or more of the children are at home. At the moment, I tend to take the wireless...

You need the sheet material brochure, not the timber and mouldings one. I can see how I might have confused the issue by saying "Champion's Timber brochure", but that's the company name, hence the capital.

And here's a cut and pasted chunk from the Champion's Timber brochure... Solid Pine Board Manufactured using Scandinavian Redwood Pine, not the cheaper less attractive spruce. Constructed from narrow widths of kiln dried timber averaging around 12% moisture content, which is then...

B&Q sell 22mm, I know this because I'm about to butcher a length for a shelf in my downstairs cloakroom. It's not cheap, however.

Wickes, Champions, B&Q, Homebase...

I don't think so. Any method that I could think of fails, because the bin cannot start to slide out until the door is pretty much fully open. I spent a few hours thinking about this, and eventually decided that there was no easy solution. However, I'd be happy to be proved wrong! [Edit} Apart...

Is there a DIY surgical forum on this site? I fear I may have cracked a rib or three laughing uncontrollably at all your oh-so-funny responses.

Yellow tiles? That's actually a bottle of washing up liquid. I'd no idea you were blind as well as frustrated comedians. Anyway, I did, of course, lubricate the O-rings, I'm not a complete moron. The problem stems from the fact that they're the wrong size. Hence this post. Also, I have...