Interconnecting Kidde Alarms with Other Brands: What You Need to Know

Kidde alarms are designed to help protect your home by alerting everyone when smoke or carbon monoxide is detected. Many Kidde alarms can be interconnected so that when one alarm sounds, others sound as well.

To help ensure your system works as intended, it’s important to understand how interconnection compatibility works — and why mixing alarm brands can create issues.

Why Alarm Compatibility Matters

Kidde smoke alarms, carbon monoxide alarms, and combination alarms are tested and certified to work with specific, compatible Kidde models. These combinations are carefully evaluated by independent testing organizations such as UL Solutions and Intertek.

Because of this testing:

• Kidde alarms are listed for use only with compatible models identified in each product’s user guide
• The performance, signal timing, and alarm response are verified only for those approved combinations

When alarms from different manufacturers are interconnected, the system has not been tested or listed as a complete system, which may impact how it performs.

Safety Codes and Testing Standards

Kidde alarms are evaluated under nationally recognized safety standards, including:

• UL 217 (for smoke alarms)
• UL 2034 (for carbon monoxide alarms)

These standards help ensure alarms operate correctly when installed as directed.

Interconnecting Kidde alarms with devices from other brands creates a system that has not been tested to these standards as a complete installation. As a result:

• The system may not meet NFPA 72 or local code requirements
• Alarm signals may not transmit or synchronize as designed
• Overall system performance cannot be verified

How to Check Interconnect Compatibility

Every Kidde alarm includes a user guide that clearly lists which models are approved for interconnection.

These compatibility tables:

• Include only Kidde-manufactured alarms that have been tested together
• Confirm proper signal transmission and alarm response
• Help ensure you have a fully listed and compliant system

If a model is not listed in the user guide, it has not been evaluated for interconnection and should not be used as part of an interconnected system.

Important Warranty Information

Kidde’s limited warranty covers defects in materials, workmanship, and design during normal use.

However:

• The warranty does not apply to system-level performance in untested or mixed-brand configurations
• Issues related to alarm interconnection with non-compatible devices — such as failure to activate or communicate — are not considered product defects
• In mixed-brand systems, Kidde may be unable to honor warranty claims if system performance cannot be isolated to a Kidde device issue

Kidde’s Recommendation

For best performance and peace of mind, Kidde recommends:

• Using only compatible Kidde alarms when installing an interconnected system
• Following the compatibility guidance provided in each product’s user guide

If your home currently has a mixed-brand alarm system, contractors and builders should consider transitioning to a single-brand, listed configuration.

Kidde offers a full line of smoke alarms, carbon monoxide alarms, and combination alarms that are designed and tested to work together as a complete system.

Need Help Choosing the Right Alarms?

If you’re unsure which Kidde alarms are compatible with your system or need help selecting the right products for your home:

• Refer to your alarm’s user guide
• Visit Kidde.com for product information
• Or contact your Kidde representative for additional support

Proper compatibility helps ensure your alarms work together — so your home is protected when it matters most.