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I have a Vokera 20-80 RS Flowmatic and I have had surround sound for approx three years with no probs.Recently had work done on heating system and now when boiler fires for central heating I get a buzzing sound coming through my TV speakers. Not the end of the world, but annoying. Sound only...

Having problems with the above boiler and British Gas. Hot water is fine however central heating only heats upstairs radiators.If I isolate upstairs and close all but one of the downstairs ones I get heat in the one thats left. The boiler does not lockout or discharge through the pressure...