7 weak spots in home alarm systems, and how to fix them

1. It can't call for help

An alarm is only as good as its connection to the outside world. Panels that report only over a landline stop working if the line is cut, or if you've dropped your landline and forgotten the alarm used it. Many older panels used 3G cellular radios, and those went silent when carriers shut down their 3G networks in 2022.

Fix: make sure your panel reports over a current cellular connection, ideally with internet as a second path, and ask your monitoring company for a test signal.

2. The keypad can be smashed before the alarm goes out

When you open the door, most systems give you an entry delay to disarm. If the panel waits until that delay ends to report, an intruder who quickly breaks the keypad or panel may stop the alarm from ever reaching anyone.

Fix: use a monitoring service with "crash and smash" protection, which reports the moment the door opens, and keep the main control panel out of sight, away from the keypad.

3. Some openings were never protected

Installers often protect the front and back doors and stop there. Common gaps: basement windows, the door from the garage into the house, side and mudroom doors, sliding doors, and second-floor balcony doors.

Fix: walk the house and list every door and window someone could fit through, then compare it with the zones on your panel. Interior motion sensors add a second layer for anything you can't cover directly.

4. Long entry delay, keypad in plain view

A long entry delay gives an intruder time. A keypad visible through the door glass tells them where to go and whether the system is armed.

Fix: keep the entry delay as short as your household can comfortably manage, and place keypads where they can't be seen from outside.

5. Old codes still work

When a house changes hands, the previous owner's codes, a former housekeeper's code or an installer code are often still active. The same goes for old app logins on the monitoring account.

Fix: change the master code, delete every user you don't recognize, and make sure the monitoring account and app are in your name.

6. Alerts go nowhere

Notifications set up for an old phone number, a monitoring call list nobody has updated in years, or a self-monitored system whose alerts get muted.

Fix: review who gets called and texted, in what order, and test it. If you're away for the winter, add a nearby neighbor or family member.

7. Dead batteries and ignored trouble beeps

Panels have a backup battery that typically needs replacing every few years, and wireless sensors run on their own batteries. A system that has beeped "trouble" for months may have sensors that no longer report.

Fix: clear every trouble condition, replace old batteries, and walk-test each sensor at least once a year.

How to check your own system

1. Call your monitoring company, put the system in test mode, and open each door and window one at a time. Confirm each one registered.
2. Ask how your panel communicates and whether it has crash-and-smash protection.
3. Review the user codes and the call list.
4. Clear any trouble messages on the keypad.