Intercom Not Working? A Guide to Troubleshooting and Fixes

An apartment building’s intercom system works 24/7. Over time, thousands of door openings, temperature fluctuations, and humidity can lead to malfunctions. If your intercom is not working, it doesn’t always mean you need a brand-new system.

The experts at Fonolukk.eu have identified the 5 most common causes of intercom failure and how to fix them.

1. Faulty Handset Inside the Apartment

This is the most frequent issue. If the bell rings but you can’t hear the visitor or the door won’t open when you press the button, the problem is likely in the handset.

• Common Cause: A stuck button or a worn-out switch inside the handset.

• Solution: Check if the button is physically stuck. If not, it’s usually cheaper to replace the handset. We stock handsets for Vizit, Laskomex, Eltis, andmore.

2. Door Closer and Magnetic Lock Issues

Does the intercom signal that the door is open, but the door stays shut? Or perhapsit won’t lock at all?

• Common Cause: An unadjusted door closer. In winter, the oil inside thickens, preventing the door from reaching the magnet properly.

• Solution: Adjust the door closer or clean the magnet of rust and debris.

3. Oxidation of Outdoor Panel Contacts

Outdoor panels in Tallinn face harsh conditions like rain, snow, and salty sea air.

• Common Cause: Moisture seeps into the panel, causing terminal oxidation. This leads to static noise or unresponsive buttons.

• Solution: Professional cleaning of the internal components. Warning: Opening the panel yourself may void the warranty or break the weather seal.

4. Switcher Errors: Cross-Talk Between Apartments

If someone dials your apartment number but it rings at your neighbor’s place, there is a technical cross-link.

• Common Cause: A neighbor might have reinstalled their handset incorrectly during renovations (reversing the “+” and “-” wires), disrupting the entire line.

• Solution: A technician must find the faulty unit and restore the correct wiring balance.

5. Main Cable Damage

If the intercom system is down for the entire building, the main backbone cable is likely damaged.

• Common Cause: Vandalism, hallway renovations, or rodents in the basement.

• Solution: Cable continuity testing by a professional to locate the break.