we just bought a 2001 Wildwood 24' trailer. It did not come with a carbon monoxide detector, but we already had one so we put it in to be safe. 3:30 AM the thing starts beeping and woke us up. The furnace wasn't on or the water heater. The only thing running was the fridge. We were in the mountains so it was running of propane. We opened the windows and doors and aired the trailer out and the detector turned off and we had a spare battery so we put it in but later it started beeping again. We went to another place to spend the rest of the night and the next morning started checking to see what could be the problem. We have checked out the venting and it all seems ok. We were wondering if anyone else has had problems with carbon monoxide or detectors. Since we leave the trailer at about 9000 feet up in the mountains until October, we can't really take it to a dealer or repairman without a lot of trouble. If anyone has a suggestion of what to look for, what to fix, etc, we would be grateful. We might have to move it down to a repairman if we can't figure it out.