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Thanks Tony, that was very helpful,. this boiler always seems to have various kinds of problems, its nine years old now and gets a lot of stick. cheers mate. :

hello, Biasi M90E 32s , hot water works but no heating,pump runs continuously,.recently had fitted, both pcbs, dhw flow switch, both temperature probes, overheat stat,. serial number NO20950705. I would appreciate any advice, thank you.