Which of the following is NOT a reason for smoke detector malfunction?

Regular testing is a crucial maintenance practice for smoke detectors and is not a reason for malfunction. In fact, regular testing helps ensure that smoke detectors are functioning correctly and can alert occupants to smoke or fire hazards. Testing often involves activating the detector and checking that it responds properly, which can also help identify any issues that may lead to malfunction, such as low batteries or dirt accumulation.

The other options listed can lead to malfunction. Low battery is a common issue that can prevent a smoke detector from working properly, as many detectors rely on batteries for power. Dirt accumulation can impede the sensing mechanism of the detector, leading to failures in detecting smoke. Frayed wires may disrupt the electrical connection required for the smoke detector to operate, which also results in malfunction. Regular testing, on the other hand, is a proactive measure that enhances reliability and safety.