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Controller is horstmann c11. Yes hw tank has stat and had already turned it right up before putting valve to manual with no success.

Hi I have just moved into a 70's built house that has a gas back boiler, expansion tank in loft, 3 way valve in airing cupboard beside hw tank. Controller and pump downstairs behind boiler. The previous owners told me the controller went wrong a couple weeks before exchange and had new one...