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Anyone help with this one!!!!!!!! Baxi 551 boiler "kettling" but only when the central heating pump is switched on. Old primatic tank so cannot put any magic powder in to stop the kettling. Main issue seams to be that the boiler is "over-running the boiler thermostat" I have put a new stat on...

Hi Please be gentle newbie!! I have inherited a problem with the above back boiler/fire from my son!!!. The pilot keeps dropping out but after 36 hours?. I have changed the thermocouple (twice). I have checked and replaced the pilot restrictor ( although the old one seemed fine) I have...