Customer Reviews for Kidde Firex Hardwired Smoke Detector with Photoelectric Sensor and 9-Volt Battery Backup

Hello. Replacing the batteries wouldn't have helped. It sounds like you haven't found the alarm setting off all of the others yet and it seems it wasn't the one you replaced. While the alarms are going off, the one setting off all of the others will have a red flashing light every second. It is also the one that if you remove it while all of the alarms are going off, the others will stop while that one will continue to go off. False alarms are most commonly caused by something interfering with the sensor. To clean, hold the unit by its edge and thoroughly blow through the gap on the side of the unit with compressed air (like keyboard cleaner). We recommend cleaning out all of your smoke alarms at least every 6 months to a year and at this point we would recommend cleaning out all of your other alarms as well as a preventative.

Some of your alarms may be in one the locations to avoid listed in the owner's manual. This would especially include alarms being installed within 3 ft (.9m) of a forced air supply ducts used for heating or cooling, ceiling or whole house ventilating fans, or other high air flow areas. We recommend that alarms not be installed near vents, flues, chimneys, or fans. We recommend that alarms not be installed near doors or windows near areas directly exposed to the weather. We strongly recommend not to install these alarms in garages, attics, and crawl spaces as you will get temperatures, dust, insects, and chemicals that can cause nuisance alarms.

Try cleaning out the alarms. If you have the issue again, find the alarm setting off all of the others and call us with that alarm in hand at 1-800-880-6788 so we can get this resolved for you.