greencurry

I have a 2005 Monaco La Palma and the furnace will not work in very cold weather. When the outside temp drops to the teens or twenties, the furnace will try to ignite and then quit. It will try for two more times before it quits trying. Since it only fails to ignite in cold temps, it is hard to replicate at the repair shop. I works fine when the temps are not so low. Any ideas?