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    Aluminium heat exchanger - best cleaning alternative to acid

    Can anyone recommend the best alternative to a soaking in acid for a fouled up heat exchanger made of aluminium? Is there even such a thing, or am I realistically looking at a new heat exchanger? (Some Extra Droffle: My Baxi Main Potterton Combi 24he boiler has gunked up heat exchangers...
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    Baxi Main Combi 24 HE. No hot water. Diverter Valve?

    Hi All, I have a Baxi Main Combi 24 he boiler that is not supplying any hot water at all now. Everything appears to be working nearly correctly. The diaphragm pushrods activate the micro-switches on both the heating and DHW sides of the diverter valve, and the boiler fires up in both cases...
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