I had the same problem and replaced the sensor. No problems since.
The safety-freaks who regulate the installation encourage users to disconnect the darn things. Unlike a smoke sensor that runs on a 9 volt battery or alarms that have a time limit, the lp/co sensor is wired to the aux battery(ies) and will sound continuously. Anyone alive would be woken up within seconds, so not having a timer to limit the alarm to a minute or two is crazy.
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