You probably already have your problem solved, but you probably have a series 610 HWH system, and if you go to their site, there are schematics and diagrams for every inch of their systems. I have a strong suggestion and that would be to download everything you can on your UF and put it in a binder. I'm finding that info is getting really hard to come by on this older model, and having hard copies is a "must have". Also, although Winnebago has a disclaimer for supporting these older units, there are a couple of guys in their customer service dept that are jewels and are great at helping out.