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Mar 20,  · It’s possible for an ionization smoke detector to mistake dust for smoke. Dust can reflect the light which can look like smoke particles. Use a can of compressed air or a vacuum cleaner to remove the dust from the smoke detector’s sensor. Remove the casing and clean around the sensor. Be careful around the sensors and wiring.

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Aug 03,  · To replace the battery in your hard-wired smoke detector, follow these steps: Turn off the power to your wired smoke detector at the circuit box; Find the battery cover panel on the detector; If there’s a screw holding it in place, use the screwdriver to remove it; Remove the old battery and replace it with a new one.