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Thanks for the info. I'll see if I can borrow a multimeter off someone.

Thanks for the offer, but I live in Bristol. It looks like I'll have to get someone out to take a look at it.

Hi I'm hoping someone may be able to help me with a faulty telephone door intercom. I live in a house that was converted into four flats over twenty years ago. The flats use a Urmet intercom system for the door that allow people to buzz the intercom phones in each flat. You can then use...

Internal wiring of intercom. Buzzer on right. Door lock release in centre.