I needed to get my gas furnace working, in the event I would be staying here in the Walla Walla valley. The over winter temps aren’t all that bad here, but I wanted to get my gas furnace up and running again as a back up to the many electric heaters I carry with me. You never know when you might have a power outage. I also have the heat pump which does a great job heating the RV but the gas furnace does it faster on really cold mornings, and doesn’t have a problem with temps lower then 40 F like the heat pump does (nature of the beast, won’t work below 40 F).
So I went to work on my gas furnace and decided that I’d need to design my own control circuit, after verifying that was what was needed. And that’s what I’ve done, and here’s the article for your enjoyment or amusement.
Take a look at this article since many of you will have the exact same or similar furnace, and have it installed the same way. You might want to buy a new control board if you have a failure instead of building a new circuit like I did but that is up to you if you have the kind of problem with yours that I had with mine.
Anyway, here’s the article: https://chaos.goblinbox.com/rv-repair-section-2/rv-repair-section-2004-winnebago-journey-dl/d-heating-cooling/furnace/
Enjoy!