My CO alarm went off shortly after backing it into driveway. I thought maybe due to having door open and truck running. I have vented the camper and tried to reset it several times. I did some research which wasn't very helpful. I did see a statement that said they had a fuel cell inside which is usually used up approx 2 yrs from manufacture. Anyone else have this issue? It is hardwired to 12 volt and has power.