How do you reset a house alarm after a main power failure?

Written by megan mattingly-arthur
  • Share
  • Tweet
  • Share
  • Email

If the AC power goes out, your home could be left without proper protection from your home alarm system. Many alarm systems feature a backup battery to prevent this from happening and save you from having to reset the entire system. If your house alarm is equipped with a backup battery, you might not have to do anything to reset the system after a power failure. However, if your alarm displays an error message after the AC power is restored, follow a few simple steps to reset the control panel.

Skill level:
Moderately Easy


  1. 1

    Press the "System" or "System Status" button on the security system panel twice to silence the "No AC" notification alarm.

  2. 2

    Remove the backup battery from the back of the control panel once the AC power is restored.

  3. 3

    Open the door of your electrical service panel and locate the circuit breaker that corresponds to your house alarm. Flip the circuit breaker to the "Off" position; allow the circuit breaker to remain in the "Off" position for five minutes before flipping it back to "On."

  4. 4

    Reinsert the control panel's backup battery. Replace the old battery with a fresh one, if necessary.

  5. 5

    Enter your four digit user code on the control panel keypad, then press the "Off" button. Repeat this step within five seconds to reset your house alarm.

Tips and warnings

  • After the system reset, follow the on-screen prompts to reset your security system features.
  • Resetting instructions may vary slightly by alarm brand and model. If these instructions do not work for you, contact the manufacturer of your security system to obtain system-specific advice.

Don't Miss

  • All types
  • Articles
  • Slideshows
  • Videos
  • Most relevant
  • Most popular
  • Most recent

No articles available

No slideshows available

No videos available

By using the site, you consent to the use of cookies. For more information, please see our Cookie policy.