It is a nighthawk combo gas/carbon monoxide detector. It went off last weekend out of the blue and flashed "GAS" and then read 233-235...we opened up windows and tested it, and it went down to 223. We had the gas company come out and check everything and they said it was fine, but our oven is maybe leaking more CO than it should, so we are getting it checked out. Since then, it has not gone off and sits in the wall always reading "0". I just tested it and it read "233" again. Should I be concerned?

Home Security - Kidde - Nighthawk Combo Gas/co Detector