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Hi there all. I have a problem with my boiler and wondered if you could help. I have a Vaillant 242 and it works fine and heats the place well for about 2 hours. When the boiler stops firing (presumably because it has decided the return is hot enough) it then seems to struggle when it starts...

I have had a few problems with our vaillant 242 and also some success but i'm a bit stuck now and just could do with some input - I would be very grateful. Details: - Boiler has worked fine with no noticeable problems until about 3 weeks ago. It stopped igniting suddenly. Followed the flow...