Question about First Alert SC9120B Smoke / CO Detector with Battery Backup & Strobe

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The 5 First Alert SC9120B units are installed in our ceiling. Three of the five are showing a blinking green light and they are sounding three horn sounds every hour. The green light is blinking constantly, not in any pattern, as in a malfunction signal, just constantly blinking. We have replaced all of the batteries today.

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Posted on Jan 02, 2017

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SOURCE: I have just purchased three

When I worked Electrical in a Hardware store we were told by Nighthawk and f\First Alert and we told our customers that you want the detectors 4-6 feet off the floor never near a water heater or furnace since this can cause false alarms. The CO will rise, so one on each floor should be enough near a central stair if possible. Other wise make sure at least one is in the bedroom.

Posted on Mar 01, 2011

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