Originally Posted by moecephus
we have a sunseekeer 2012 and the batteries are mounted under the steps. The RV dealer says he has techs who can check out the detector. The info from the manufacturer says that the detector should not be installed low or where fumes could collect.
You could easily be at the end of life for the CO detector. CO detectors are life limited - the newest and best ones for home use are rated for a max of 7 years. The newest ones beep a certain code to tell you they need replacement.
I believe yours is rated for 5 years at best, and remember it could have been manufactured a year before installation. The propane/CO detector in my 2014 Rockwood A122 A-frame has a sticker that claims a 5 year life - but I don't know when that 5 years started.
Unless your dealer has some special (and expensive) CO test equipment, there is no way to actually test the detection element. The electronics in the detector usually have a self-test button - but that does not test the detection element - which is the life-limited part.
I would replace the detector with known good before I would blame hydrogen off-gassing from the batteries.
False positive alarms are not as rare as they should be with the RV propane/CO and smoke alarms. The alarms are mounted closer to sources than they should be due to space limitations. And the time limits on the batteries in the smoke alarms and the CO/propane alarms going off for (and causing) a low battery make the situation even worse.
Back in the old days (my 1986 Coachmen pop-up), there were no alarms, but it was highly recommended to always keep the roof vent cracked open, especially when using the stove - even in the rain. Still good advice, IMHO. I generally keep the A-frame vent cracked over the wife's objections on a cold night.
just my thoughts and experiences, yours may differ
2014 Rockwood A122 A-frame
2008 Hyundai Entourage (minivan)
camping Colorado and adjacent states one weekend at a time