St8ofbeing

I really appreciate all the replies. Very helpful. Last year i did not link the winterization to the alarm. But two years in a row seems like a trend.

Thank you Bill

BTW we have a 2023 Oliver Elite II Hull #1340

This is the 2nd year in a row we have had CO alarm from the alarm under the dinette in the first few days following winterization. Last year I called Oliver and they sent out a new RVCOLP-2 unit and I replaced it. No more issue till today after we winterized on Sunday. My thoughts for troubleshooting are to order a handheld CO detector from amazon and put the CO unit back in. Once it alarms test using the handheld. Could this be caused by AntiFreeze smell coming from the toilet? Do we need to air out the trailer post winterization? Any other thoughts? Is there a better CO detector I can buy and install? Thanks in advance.