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Hi I'm getting some deep pile Saxony Carpet for the bedroom. Pile height is 18mm, and 2mm backing making 20mm total hight. I'm getting my underlay online - what would be the most suitable underlay in therms of thickness? I'm thinking of 9mm PU foam as I feel that any thicker might cause...

Thanks chaps, I performed the CH only test as per //www.diynot.com/forums/plumbing/boiler-central-heating-faqs.175736/page-2 and got nothing so it would seem certain to be the mechanical valve?

Hi, yes there is a motorised valve in the airing cupboard. The lever seems to be in the 'auto' position. It moves very freely up/down with no audible click or any change from the boiler end. Here's a (bad) photo :

Many thanks for the quick reply :) Ok, done that - still nothing from the boiler...

As an aside, I noticed that when the boiler is on for HW heating the radiators warm up - is this the norm?

Hi I am having issues with getting my ancient (Gloworm Fuelsaver F) conventional boiler to fire up for central heating. When the room stat - (a Theben Ramses 811 top1) has been turned up and heard the audible 'click' the boiler does nothing. DHW is running fine and the tank thermostat fires...

So can you confirm that both - bonding to hot water pipe - running earth to mains circuit are not an option? Thanks

Yep, sorry - realised my error soon after posting!

Thanks for the response, will see what I can do. Is earthing to the pipe / other mains socket a no-no?

Hi We're in the middle of redecorating our kitchen and would like to replace the white plastic light switch with a metal faceplate dimmer (non-double insulated) Obviously this needs to be earth so imagine my joy when removing the old switch I found that the earth wire has been snipped back...