Intercoms and doorbells are small pieces in the security puzzle, but important ones. If your doorbell isn’t working, a visitor might bang on the door or shout, or worse, give up and assume nobody is home even if you are. On the flip side, you might miss deliveries or urgent visitors.
With intercoms, a faulty system means you can’t verify who is at the main gate or lobby before they come up. That pushes you back to opening the door “blind,” which defeats the purpose of having the system.
Testing them now and then—pressing the bell, using the intercom to call up and down—lets you catch faults early and log a repair request with the building or electrician. When the system works reliably, all your other good habits (locking doors, checking before opening) have proper support.