We're still relatively new to RV'ing, but I hope this helps. We recently ran into some issues with our Atwood furnace, and eventually was able to get it working after a very chilly weekend in Death Valley. Here are some ideas to try:
1. Confirm the gas is working by checking the propane tank level and main valve position. If full and open, light all of the burners on the stove to see if the system is able to provide high flow. If they all light, it shouldn't be a gas problem unless there is an issue with the furnace piping itself.
2. The Atwood furnace runs off of 12v. After confirming the fuse isn't blown, a likely cause is a battery issue. Without a battery charger to test and charge the batteries, we were able to get the furnace working after the drive home. Essentially running the coach for awhile may also solve your issue, or take a trip to get a battery charger.
Good luck!
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