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Hello Hope you can help. Hot water is working but central heating only comes on sporadically (usually for 20 minutes then switches itself on and off but the radiators go cold). British Gas and my plumber have tried the following without success: 1) Replaced divertor and pump. Did...

Hope you can help? I have hot water but the central heating only comes on occasionally. When the heating does come on it tends to turn itself off after an hour or so. Sometimes this seems to happen when the hot water is turned on for more than a few seconds. The boiler also randomly turns...