What have certain electrical components stop working in my house?

To be specific, my door bell, intercom system and home alarm system stopped working. I checked the fuses and everything is OK. I’m no electrician so I have no idea where to begin. Any tips where I should begin looking?

Are all three of these systems wireless? You could have interference from a neighbor who just installed something new. If not wireless all three of these are low voltage systems and could possibly have a common transformer. Check for a transformer (AC adapter) around your alarm system box to see if it is plugged in and the wiring from it is securely connected.

Old Ademco alarm keypad at my Aunt’s house (and a look at the kitchen)

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