We had the same problem with ours so we disconnected it and put the one from the house in, it never went off. So we called dealer and they said we could bring the detector in and they would order replacement. While we were there one of the service technicians asked if the upholstery had been treated with a scotchguard type of treatment when we bought it, it had. So they suggested using RV, leaving windows open and try again. We have camped and had it open for more than a month now and the smell of the treatment isn't so strong, when we first go in after it has been closed up for a while, so I think we are going to try again soon.