There are two things you may want to do.
1. Replace the CO2 monitor
2. Get your self a Gen Turi to hook up and make sure the exhaust gas is running away from the MH.
As you stated when driving the air flow will normally push/pull it away from the coach but when sitting still you need to take into account the direction and/or lack of wind.
Get a can of this Home Safeguard CARBON MONOXIDE and test your CO2 alarm to see if it's still good.
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Retired Navy Submariner
2014 Itasca Sunstar 35F; 5 Star tuned; 2014 Jeep Cherokee TrailHawk
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