What is a common reason for a smoke detector to fail to sound an alarm?

A common reason for a smoke detector to fail to sound an alarm is the failure to replace the battery when needed. Smoke detectors rely on a power source to function correctly, and when batteries are low or completely depleted, the detector won’t be able to perform its primary function of sensing smoke and sounding an alarm. Regular maintenance involves changing batteries as recommended, typically at least once a year, to ensure the device remains operational.

This option highlights the importance of proactive maintenance for smoke detectors, as neglecting battery replacement can lead to dangerous situations where a smoke detector fails to alert occupants of a fire. By ensuring batteries are regularly checked and replaced, the reliability of the smoke detector is maintained, significantly increasing safety in a building.