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I'll ask him - thanks for the advice - hopefully it might be the problem.

Thanks Nick. He did flush the tank at the bottom of the boiler out and used a acid type cleaner in the heat exchanger that did fetch a lot of gunge out. Forgot to say, the diverter was replaced. We have one of those magnetic canisters on the water pipe that takes out metallic gunge too - he...

Hi everyone - I really hope someone will have an answer to this question as I am at my wits end! We have a Worcester Bosch Highflow 400 RSF boiler and last week it stopped supplying hot water. We only have the hot water on at the moment and the heating and radiators are switched to off. My...