- Press the battery-test button on the unit to make sure the battery is properly connected.
- If the unit has a battery that's more than a year old, replace the battery (see below).
- Light a candle and hold it approximately 6 inches below the detector so that heated air will rise into the unit.
- If the alarm doesn't sound within 20 seconds, blow out the candle and let the smoke rise into the unit.
- If the alarm still doesn't sound, open the unit up and make sure it is clean and that all electrical connections are solid.
- If, again, the alarm doesn't sound, replace the smoke detector.
To replace a smoke detector battery:
- Remove the smoke detector cover, typically by carefully pulling down on the case's perimeter or by twisting the case counterclockwise.
- Locate and remove the battery. Use a multimeter to test battery voltage. As needed, replace it with a new one.
- Close the case and test the smoke detector (see above).
- Read the owner's manual for additional troubleshooting tips and possible adjustments.
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