How to Reset a Honeywell ADEMCO VISTA-20P

If the AC power goes out, you may have to reset the control panel when the electricity is restored. The alarm system control panel can also be reset to clear any minor mechanical malfunctions. Resetting an Ademco Vista-20P security system takes just seconds.

Reset After Power Outage

1. Locate the electrical service panel in your home's basement, garage or laundry room. Look for a putty- or silver-colored rectangular box that's about the same size as a phone book.

2. Open or remove the cover on the electrical service panel. Locate the circuit breaker switch labeled "Alarm" or "Security System."

3. Flip the switch "Off" and then "On" to reset your Honeywell Ademco Vista alarm system after an AC power outage.

Reset to Factory Settings

1. Access the alarm's programming mode by entering the installer code, followed by "8," "0" and "0," into the control panel.

2. Press the "*" button on the control panel, followed by the "9" and "7" buttons to reset the security system to factory settings.

3. Follow the on-screen prompts to select the desired default programming settings or consult the Honeywell Ademco Vista-20P User Guide for customizable programming options and advice.