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I have a Vaillant Turbo max combi boiler. When I turn the hot tap on down stairs I will sometimes get hot water other times its cold. I've noiticed that when its cold the boiler has not fired up. In reading a few topics by others I see there is some form of microswitch somewhere on the boiler...

Has anyone ever used the rolls of polystyrene on old walls before wall papering. I guess it's to stop condensation and mould forming as I have an old cottage with this set up and I need to re-paper the walls in the lounge.