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thanks raysparx1. I don't know how it has been connected, the boiler is in the loft and there is no way I can get up there. It was fitted by a registered corgi plumber so should be up to scratch. Think the british gas man was trying to be clever even though I made him a cup of tea. There doesn't seem to be any service these days, perhaps he wouldn't change the fuse because he is not an electrician, health and safety again. Thank you for responding but I still spitting feathers!!