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Forgot to say, replacement isn't a viable (financial) option. I'm 3 stories up, and the flue isn't accessable without a serious amount of scaffolding (and money i haven't got).

Thanks for your advice. I've just replaced the flow switch, and still no joy. When the hot tap is opened, the fan starts and the boiler appears to make all the right noises but still the main burners do not light. If you leave the tap running for around 5 mins then the burners will fire up (but...

My ferroli 77 ff takes about 2 - 5 mins before it will fire up the main burners when using either the central heating or DHW. The only reasonable way of getting hot water is to switch on the heating, wait a few minutes then run the hot tap. I called ferroli and they suggested the flow switch...