We own a 2011 Coleman Sedona, which has the Atwood 7916-ii heater. On our last camping trip, it kept acting up. It would run for a few hours and then suddenly start having problems, where it would just quit in the middle of the heating cycle, without cycling out the heat (fan on, burner off). It blinked one red light every three seconds which I understand is the code for a limit/air flow problem. I was able to push the reset button on the furnace and cycle down he thermostat. That seemed to reset it and let it run a few more hours. I'll also add we were running on battery at the time. I had the circuit board tested at a local RV shop and it came back great. I've replaced the limit switch and am working on the sail switch. There is virtually no dust, dirt, or anything else in the furnace. We store it in our garage during the winter. My conclusion is that the battery got below the necessary 10.5 volts on a draw from the motor. The battery is over three years old and did sit in our garage in Colorado during the winter. I did charge it a few times with a battery tender. It did test okay a the battery shop, but went down to 10 volts on draw (Which is right on the edge of their cut off for a good battery). Anything else you can think might be wrong? We leave next week for a trip and I'd love to have heat. Thanks!