We have the same problem on this propane fuel unit. It will hold temperature for a couple days but then then fan blows and there is no fire in the box. We have been turning theb unit off at the thermostat, waitnig a few minutes and turning it back on. The unit then fires up for a few days.
The technician says he thinks the burners are rusted?? and thay need to be replaced?? Any other ideas will be appreciated.