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Hi guys first post here. I am in the middle of a major renovation of my flat and wanted to swap the intercom with a newer and smarter looking one. The old model is Videx smart 1 and would like to replace with fermax loft 3399. I have tried to follow the wiring diagrams and it actually works, however there is always a very very loud buzz which can be heard in the speaker in the handset and downstairs. PS I live in a block of flats.
Can anyone help please?
Can anyone help please?