I have a 2020 Jayco Eagle HT faith wheel. The owners manual says there is an Atwood furnace. Earlier today it would

Good evening! My name is ***** ***** I am a Master Certified RV Technician and have been in this business nearly 20 years and on this site for over 12 years. I have responded to over 75,000 questions, so there is not a lot I haven't seen or heard about. I also teach people like yourself about RV systems and appliances at the local JC every now and then. I know this is technical stuff, but I like to keep it personable if I can. Who am I assisting here with this please?

Sorry for the delay in someone getting to your question here! It has been crazy busy these last few days. I used to have an RV repair facility and worked on these systems for a living. Please give me a few minutes to type up an answer here for you. And don't be alarmed if I don't get right back to you when you respond. We work on more than one question at a time here when it is busy like it is now. I may be on a phone chat with another customer and those usually last less than 5 minutes. Your patience is appreciated! Thank you for bringing your question to us here at Just Answer and your trust in our reputation is appreciated!

I am sorry to hear that you are having a problem with your Atwood furnace. I should be able to get this sorted out quickly and I will try my best not to make this sound like "rocket science", but please remind me about that if I do. Thanks! Randall

The two most common causes of this are a dirty sail switch which you have already addressed and a failed flame sense on the control board.  It allows the furnace to fire up for about 10-15 seconds and then turns it off since the control board didn't "see" any flame and shut off the gas valve.  The fix is a new control board and I would install a superior aftermarket board made in Oregon by Dinosaur Electronics.  Your model would use a "Fan 50 Plus" version.  About $97 on Amazon last I looked.  Easy to swap out.  I hope this proves helpful here.  If you don't have the Atwood Service Manual let me know and I can provide a link to one.  Randall

Same thing.  Dometic purchased Atwood a few years ago.  https://myrvworks.com/wp-content/uploads/2019/04/Atwood-Furnace-Training-Manual.pdf

No.  That control board fits ALL furnaces made after 2004 that are 12-volt models.  It should last the life of the furnace, unlike the junk in there made in China.  Randall

Great!  I don't expect that to last long, but at least you know what the next step is when that board gives out.  Broken solder joints act that way sometimes.  They work for a while and then won't.  Thanks for that update and please have a great New Year!  Randall