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Most smoke detectors and carbon monoxide (CO) detectors are designed to last up to 10 years. After this, their sensors can weaken, making them slower to respond or increasing the risk of a faulty fire alarm. Even if everything appears normal, an ageing unit may no longer offer reliable protection.
Knowing the timeline is important – but understanding why helps you act sooner and more confidently:
Over time, dust, debris, and general wear affect the sensitivity of a smoke detector or heat alarm. This can lead to missed detections or frequent false alerts. If your smoke alarm is not working properly during testing, or you’re experiencing repeated nuisance alarms, it’s a clear sign to upgrade to a modern replacement alarm.
A carbon monoxide detector protects against an invisible, odourless gas, so accuracy is critical. As the sensor ages, it may fail to detect low levels of CO. If your CO alarm is older or showing signs like an alarm beeping unexpectedly, it’s time to replace the unit entirely.
For alarms with replaceable batteries, changing them twice a year ensures uninterrupted protection. Chirping sounds often indicate low power – but if replacing the battery doesn’t stop the noise, you may be dealing with a fire alarm faulty due to age.
Frequent false alarms, visible damage, or an alarm that fails to sound during testing all point to a replacement cycle that’s been reached – or exceeded.
If your smoke alarm is still in date, but is false-alarming, check out our blog on causes of false alarms and how to fix them.
Upgrading your alarms is an opportunity to improve your home’s safety, not just replacing older models. FireAngel designs advanced, reliable smoke alarms, heat alarms, and CO alarms with 10-year lifespans, helping homeowners stay protected with minimal maintenance.
If your alarms are approaching 10 years old, don’t wait for them to fail. Upgrade to FireAngel and ensure your home is protected by technology you can trust.
If you can't find what your looking for on our blogs and looking for further guidance and advice, our UK-based Customer Support team are on hand all week from 8:30am until 5:30pm, they can answer any further queries you may have on our products, solutions or services.
