Can anyone tell me what this switch does? It’s on a 2022 Tiffin Wayfarer. I am not the owner of the rig but trying to learn about it. It is equipped with solar. We turned it on while trying to get the hot water heater to work. It didn’t seem to do anything until we turned the rig off then you could hear an audible pump/ gurgling type sound so we turned the switch off and it stopped. It is not labeled. My husband said it sounded like it was on the roof to him but I couldn’t tell. Maybe the washer dryer ?