WINNE33 -
Two important data items are missing. We need to know the manufacturer and the model number of your furnace.
Visit this
link to see what I did with mine some time ago. (Our posting is about the 4th one from the top. Read the other postings, too.)
Also, if you bought the RV as new the dealer should have made sure you had an owner's/operator's manual for it. If you don't have one, you have several options:
1. Once you figure out who made it and the model number, search the 'Net for their website, go to their technical help page and try to find an on-line version of the manual.
2. Call the manufacturer directly and speak to their technical people. They should be able to mail you a copy, although they may charge you for the service.
3. Call an on-site repair place to come out and fix it for you.
4. Take your unit to a dealership and have them fix it.
I was told that the majority of furnace, start problems are caused by dirty contacts on the circuit board, so the very first thing to do is clean those contacts. If that doesn't work, you can pull the board and take it to a larger RV repair shop and ask them to test it. Many of them have equipment set up for this. Or, you can buy a replacement board and install it yourself on faith.
Best of luck.