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Yes, and in theory that's easy to test but as you can see, it's not as clear as you've described...

OK thanks for the detailed explanation, that helps :) Soooo, is the faulty one's switch is now on forever (or until freed up or replaced) or if I switch the fused spur off, will it reset, in which case, if it does I could test each MV one by one by switching it on and seeing how the boiler runs...

Thanks but this would surely mean the rads of that zone would be getting heat?

This is fine, have done lots of wiring in the past and have a very good multimeter. But is it easy enough to explain exactly how I go about checking? The pump is constantly on and very hot unless I physically switch the boiler off so I presume I need to sort this ASAP for fear of damaging the pump?

Thanks Fezster - so how do I check this? Would that not mean the valve at fault would be stuck on open so therefore the rads are always on (which they're not)?

I have a closed heating system with 6 motorised valves to zone the rooms/areas plus a heat leak (two 1” vertical pipes are joined by 15mm pipes). I noticed recently boiler continually firing up for a minute or so even though all zones had reached temperature and to double check I turned all...

The main switch tripped so unless I switched the light circuit one off it would keep tripping every time I switched it on. In fact, I had to switch ground floor, 1st floor and top floor off (problem is on 1st floor) or it would keep tripping, but once main switch back on I can switch ground and...

No

A light which has been working fine for years has decided to stay on a few days ago. Today the light circuit board tripped and through trying all the MBC’s it’s the same circuit which is causing it to trip. I assumed it was the switch broken/staying on so swapped it with another but the whole...

But normal Carlite finish plaster goes straight over top of the sand/cement right?

Sorry, yes of course, no bond needed as it's brick! OK, but what do you mean by 5.1 top? As in sand and cement mixture? The top coat is plaster, it's inside. What's the reason for the different sands then and while not being ideal, what's likely to happen if I use building sand?

Hi, what's the mixture for sand and cement for a bare brick internal wall, prior to bonding and finish plaster? Also I have a load of building sand sitting in the garden from a project, will it suffice or is it strictly plastering sand you need to use – it's literally just for a 3sq m alcove...

Can you use a spray gun to apply eggshell paint. Assume if you can 50/50 thinned with white spirit?

Someone's also recommended a Marcrist dry drill diamond tip, any views on those?

Hi, not much more to add... any recommendations for drill bits? Thanks

No, honestly, I'm not being fussy, the finish is apauling. I've done 2 top coats now ans all I'm doing is thickening both the smooth and rougher parts so it's always looking the same. It's like a nap, in each direction the areas are light and dark but change looking from the other way.

I'm painting a freshly plastered ceiling using Leyland matt white emulsion. I did a 80/20 paint/water mix fist to seal it. Paint feels very thick to me – load roller, do 4 or 5 swipes and by the time you come back to going over the first swipe, the edge marks are hard to roll out, have to apply...

Hi Do I need to prime or lightly key a soft sheen wall if applying matt emulsion over it? It's the Valspar V700 matt which says it's a paint and primer in one so assume it'll go on fine. 110sq m of hall and landing to redo so could well do without any prep!! Thanks

This is one of 9 circuits in a 47m sq m room, sod the bills, it's about the look! ;)

Oh, so change bulbs to LED then and sorted...?