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I just used plain water and it has done the trick, but for how long is another matter. If/When it goes again then i'll get some of the DS40 that you mentioned Thanks for your help mate!! :D

Thanks for your advive dave. I have cleaned the HE. A load of black gunk came out of that, must have built up over the months/years that its been installed. As for the DV, Do i change the whole thing or just the valve itself?? I've tried to get the nuts open both ends and they are stiff to...

Hello to everyone on DIYnot. I seem to be having trouble with my biasi boiler. I have noticed that the temperature of the hot water keeps dropping out when i use the shower. The boiler will work fine initialy but then cut out a fire up again. The radiators also heat up when the shower is being...