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I have had the eng back and he has added TSSM -4 sludge remover and is to return mid week to flush system completely (will mention fan venturi when he comes -- by the way he is also an approachable corgi reg eng) and further to gaz_man_gaz I did try the suggestion of seeing if the CH pipe...

will have to respond tomorrow as heating is on and will stay that way (ACCORDING TO HER IN DOORS) when I get chance I'll check although I think we will find that it doesn't

I have a Vokera excell 80 SP --- 9-10 years old recently serviced(new diaphragm etc) central heating appears ok its the hot water thats the problem - it comes on and heats up but will go cool and warm up again or even go cold and warm up again even though the burner is continually burning during...