While this is probably board related, I also had a similar problem on a very cold evening. My furnace would shut off after a short time. If I waited it would start then stop again after 10-15 seconds. I finally had the brilliant (ahem) idea of checking propane on the stove. It was very weak. Hmmmm, I KNEW the tanks were full. Turns out I was ready to learn my first propane vs cold weather lesson. The tanks were so cold they would not flow proper volumes of propane. From that day forward I have them wrapped in foot heater blankets and have never had an issue, even down to 10 degree temps overnight. I simply hit the switch for each blanket right before evening and that's it. Uses a surprisingly small amount of my battery amps as well.