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TLDR OK, this is not so dozy a question - and the background is below for people who want to know why I am asking this, but bottom line: What is the technical reason for anti-cycling lockouts? Does constant firing use too much gas, wear something out - what? Put it another way: If there was...

Great minds think alike! I did consider this - but rejected it for two reasons: 1. The existing skylight is in a roof with an adjacent wall (side of the house) so looking up through a pyramid lantern, I would see a big wall, whereas, the current rooflight, because it is almost flat, just gives...

A BIG thanks to you all for your input - some really useful (and sanity reinforcing) comments here. To be clear, if I could have found someone to do the replacement sealed unit I would. (I was going to specialists - not the usual white PVC window installers). You are right, it is Planitherm...

That's more like it Harry - I like your "pioneering" spirit! I have been wondering... instead of dry air (where am I going to get any of that in this country?..) about some sort of inert gas - and given that it was filled with Argon in the first place, I have just rather surprised myself by...

Thank you @crank39 and @mrrusty ! I guess the reason for the sizes, is that whatever individual panes are used, it all needs to add up to 28.8 - so as to fit in the upstand and teh extruded aluminium (I guess) edge that runs around it. BUT when you say "Fitted" - that's the challenge.. I am...

Unfortunately, my warranty (for the sealed unit) wasn't insurance backed, so if I do pay to fix the problem (basically, by buying a replacement from the new company owners) I become an unsecured creditor - and I can't imagine that will go well.. So yes, my plan was to rinse the inside of the...

Stick with me on this - there is a method in my madness.. I have a 1000 X 1500 Sunsquare skylight (https://www.sunsquare.co.uk/product/skyview-rooflight/) The sealed unit in it is a bit special: - 6mm toughened soft coat low E outer pane. - 14mm Argon filled silicone sealed cavity with a...

Ah, I see what you are saying - but that's not me saying that. it's the dude who wrote that blog LOL! I agree with your analysis though, HOWEVER, while I can't comment on the zone valve closing during anti-cycling (simply because I have never experienced that) my pump DOES stop during...

@Johntheo5 thanks so much for this! My apologies for not being sufficiently clear: If I set D2 to default time of 20, you are correct, that according to the table, with a target of 60C, actual anti-cycling time will be 6. That's what I get in any case with D2 set to 10. HOWEVER, if I set D2 to...

@Johntheo5 – my big apologies, I should have been clearer that I was the one that set these. D0: 12 – yes, 12K otherwise I find that when the burner fires, it heats up faster than it can modulate back down – so I get a burst of about 15 secs and then nothing until.. D2: 10 – because if I set...

Oh thank you so much for this! It's an EcoTec Plus 837 and yes, I have an upstairs Bathroom towel rail that is always on - even though, as you say, the zone valve is closed (only opens when the timer calls for upstairs heating in the evening. Now, there is some weirdness - which will probably...

Thanks! So what would this by-pass typically consist of? I ask, because I have all UFH on the ground floor and normal rads upstairs (on a Y Plan). This was installed by a heating engineer (not me) as part of a refurb 11 years ago - and I am not aware of any components that could be deemed to be...

Two data points that may help: 1. I have had my system in for about 10 years now - with Ground floor all UFH and upstairs normal rads. 10 years is long enough that I have been able to experiment with one winter season running 24/7 - on the grounds that once you heat up the entire mass of the...

So, I just turned the mixer up to max, and control the flow temp at the boiler. In that way, I can dial it down to 60C max, which is how I get the above manifold temps. In any case, are you sure your mixer is, well, properly mixing? Just to be on the safe side, I bought a service kit...

I have had a similar challenge to you, so here are some top tips of things I literally last changed/adjusted in Sept: 1. Boiler is Vaillant Ecotec Combi. Despite what is said here AND all the Vaillant documentation, it just doesn't work when you set target temp for Return (as opposed to flow)...

Hold on - you say you have a "gravity feed system" so does this mean you have a hot water tank - where the water is heated in the tank via the heating circuit heat exchanger (basically a curly copper pipe running from top to bottom inside the H/W tank)? If you do have this, then check that the...

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@mrrusty appreciate that - you have made my day! Right, I'll get cracking trying to find a manufacturer locally.

That is tempting, but it is only cloudy - no other damage - and as one of the panes is laminated, it would take a 747 to smash through it I suspect. Sunsquare (the new version after administration) still says that the glass can be replaced BUT I asked them to quote for a brand new...

So this is the challenge.. I am based in Wiltshire and there are three Double Glazing Repair specialists in the vicinity: blown units, replacement locks/hinges, that sort of thing. All said, that they just don't do this work. So, I will need to get a glazed unit made (but see above - that...