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Just an update for anyone else whom has this problem & thanks to those who replied. The engineer did eventually return and to cover all the bases I had bought a replacement Thermostat and a Thermocouple from one of those boiler sites on the internet. I wathched whilst the chap changed these - he...

Thanks for the replies Agile & Palmyra. The chap did come back the other day (after a bit of a chase) before I posted on here and he adjusted the heat input down as originally I had told him it was the larger GW 55 boiler (I subsequently found the model stuck on the bottom plate of the...

Hi - I realise this post is quite old - but I seem to have the same problem - same BBU Glow Worm 45 , following a service & the engineer doesn't seem to have a clear idea of a fix. If the original poster is stilll about - did the fix work long term? Does anyone know how to "adjust a bit the...