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Thanks for reply much appreciated. Sorry to ask more but I think the electrician tried everything he could and I've lived here for 15 years and it's only recently started humming, no idea why. The circuit box is in my bedroom so it's a right pain. Is the bell transformer just for the door bell...

Hi, I have this exact same problem, did you ever get this resolved. I've lived in my flat for 15 years and only noticed it in the last couple of weeks. One of the MCB switches powers the Lights, doorbell and MEV-M. I've have the MEV-M checked and that is fine I've also had an electrician out who...