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Just been to one of our installers jobs because customer said boiler wouldn't go off when the heating was turned off on the Hive. It's a heat only 100 series boiler. So I turn on the heating on the Hive and boiler comes on but when turned of boiler keeps running. I take off hive receiver from backplate and boiler goes off and 3 port closes to hot water. Put it back on and try Shaun to test when off my white of motorised valve is dead and all good but still 240 at switch live. But if I test between neutral and switch live the boiler shuts off. Strange. I've replaced the Hive so know it's not that. Could it be that the installer took out and through away the capacitor that should be between neutral and switch live #1