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Thanks both for your advice, I don't do any work myself, I have a local long suffering plumber to do that. I presume he'll know what the Jimmy flapper is will he? Cheers

I'm kind of getting to the end of my tether on this one as I would appreciate so experienced advice please. Our viessmann 100 boiler started f4 erroring about 2 years ago. Press reset and it'll work for an hour, maybe 2 then errors again. The burner unit looks like new, it's very clean. So far...