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Thanks to everyone who has responded. The engineer who installed the boiler is having a look at it as I type. At least I have an idea what the problem is and he is CORGi registered. Thanks Again for your help it's appreciated. I will let you know what the problem was?

Hi My sister in law, a single mum is having problem with her halstead combi boiler ace/ace high, the heating won't switch of with the timer or timer override won't switch of the heating also. The boiler has to be totally powered off to switch heating off. she has 3 mounths warranty left but not...