📘 First Alert manuals • Free online PDFs
First Alert logo

First Alert Manuals & User Guides

First Alert is a trusted leader in home safety products, manufacturing reliable smoke alarms, carbon monoxide detectors, fire extinguishers, and smart home security solutions.

Tip: include the full model number printed on your First Alert label for the best match.

About First Alert manuals on Manuals.plus

For over six decades, First Alert has been a premier name in residential fire safety, dedicated to protecting families and homes with reliable detection technology. Now a part of Resideo Technologies, Inc., the brand offers a comprehensive portfolio of safety products including smoke alarms, carbon monoxide (CO) detectors, combination alarms, and fire extinguishers. First Alert also produces safes, cash boxes, and the innovative Onelink smart home series, which integrates voice assistants and mobile connectivity for enhanced home protection.

First Alert products are designed to meet rigorous safety standards and provide early warning in emergency situations. From traditional hardwired and battery-operated alarms to modern interconnected systems that communicate hazards across the home, First Alert continues to innovate to save lives. Their devices are widely used in single-family homes, multi-family units, and commercial spaces, ensuring peace of mind through detection and preparation.

First Alert manuals

Latest manuals from manuals+ curated for this brand.

First Alert SMI100 Battery-Operated Smoke Alarm User's Manual

User's Manual
Comprehensive user's manual for the First Alert SMI100 battery-operated smoke alarm, detailing installation, testing, maintenance, features, troubleshooting, safety tips, and warranty information. Provides guidance on optimal placement and response to…

First Alert manuals from online retailers

First Alert support FAQ

Common questions about manuals, registration, and support for this brand.

  • How often should I test my First Alert smoke or CO alarm?

    It is recommended to test your First Alert alarms once a week using the test button to ensure the unit is functioning correctly and the batteries are active.

  • What should I do if my First Alert alarm is chirping?

    A chirping sound typically indicates a low battery or that the alarm has reached the end of its life. Check the battery first; if the unit is older than its rated life (often 7 or 10 years), replace the entire unit immediately.

  • Where should I install First Alert smoke alarms?

    For minimum coverage, install a smoke alarm on every level of your home, inside every bedroom, and outside every sleeping area. Avoid installing them near kitchens or bathrooms to prevent nuisance alarms from cooking or steam.

  • What is the difference between photoelectric and ionization smoke alarms?

    Ionization technology is generally more sensitive to fast-flaming fires, while photoelectric technology is better at detecting smoldering fires. First Alert recommends dual-sensor alarms or a mix of both types for maximum protection.

  • How do I contact First Alert support?

    You can contact First Alert support by phone at 1-800-323-9005 or visit their online support center for troubleshooting guides and warranty claims.