I'm not suggesting you use the heater until it's diagnosed and running properly, but I also distrusted catalytic heaters - to the point of paranoia. However, I had several firemen in my unit and asked them their thoughts on cat heaters. They had the same thoughts us71na had, they can be extremely dangerous, BUT - with adequate "make up air" (that is an open window or 2), they're perfectly safe. They really aren't very efficient without a fan to distribute the heat, but they'll do in a pinch especially if the camper has no electrics. I, however, wouldn't buy a new one. Just pile on the sweaters, blankets or get a good sleeping bag.
'16 JAYCO 154BH SLX, Baja Ed
'13 Silverado 1500LT, 4WD, Ext. Cab, 5.3 ltr.,LNG BD
"Fair Winds and Following Seas"