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My mum has a Vaillant Ecotech boiler controlled by a wired VRC400 stat with weather compensation. It's started playing up with temperatures in the house when it's supposed to be 'off' being too high and the heating bill has shot through the roof. We could never work out how to use the thing...

I have an air vent to a basement and after heavy rain sometimes water appears from around the vent in the basement. On the outside above the main vent, in the brickwork, are 2 plastic inserts as per the photo attached. I think either water is being blown down the main vent or maybe water...

I had a Vaillant Ecotec Pro 28 fitted in 2016 and have had it serviced each year by the heating engineer who fitted it. This year I noticed that when the hot water tap is on full the temperature is nowhere near the 55C the boiler is set at. I rang the heating engineer and he said it was likely...

Perhaps foolishly last weekend I drained my CH system and fitted a Magnaclean thinking that I would get the pipework and radiators clean in case I had to have a condensing boiler fitted if the Vaillant 837E packs up. I added an extra drain valve at a lower point in the system too, put in Fernox...

I have a 9 year old Vaillant TURBOmax Plus which developed a problem a couple of years ago. When the central heating is on sometimes the radiators go cold. When I go to the boiler it is still churning away as though it is working (fan/pump going) but the heating indicator light has gone out...