CO/Propane detector

I have a combo LP/CO detector (Safe-T-Alert model 70-742R) mounted near the floor, as well as a CO detector on the ceiling. I have been having trouble with the LP detector since the RV was new (over 2 years now). I have finally ruled out everything else and both the dealer and I have concluded that the detector is faulty, so I am getting a new one. Unfortunately, I will have to pay for it, since the detector is well out of warranty. I should have sent it right back to the manufacturer the first time it went off but, as others have pointed out, there are many reasons for a "false" alarm: water heaters, aerosols, low batteries, outgassing, even dog farts. Since any and all of these can cause an alarm, the only way to find a problem with an occasionally false-alarming detector is to have it taken apart and checked by the manufacturer. I do get the feeling, though, that these things have a fairly low reliability record.