Furnace only works when resetting fuse

One thing you may want to try is remove thermostat and cycle the furnace by touching the wires together. Simulate the action of the thermostat, run it till interior is warm enough. The break the connection for a bit then try again and see if the furnace restarts.

I had exactly the symptoms you describe turned out to be a defective mechanical thermostat.

I do say the limit switch lockout is a good possibility. Checking for restriction good idea.

DazedNConfused wrote:
Good evening....

On our family camping trip this past weekend, it was cool enough to use the heat. I could turn the heat on, set the thermostat, and the blower would spin up followed by nice toasty warm air. However, when the proper temperature was reached and the system turned off, it would almost never come back on again. I had to pull the 12v furnace fuse, reinsert, and it would instantly fire up again. Maybe once or twice it cycled on its own, but without fail, each night we'd wake up cold, I'd crawl out of bed, pull out and reseat the fuse, furnace would kick on, and I'd crawl back in bed again. Ths would repeat throughout the weekend. Any ideas?

Thanks,
Rob