Heat not coming on

OK. So, mystery solved AND not solved. The switch I had found near the galley was for the water heater so that was me being dumb. However, here's where it gets strange. I opened up the panel on the outside of the rig where the furnace lives. 4 screws I had never taken off. intention was to blow compressed air around and check any leads I might find in there since all the fuses and breakers inside were all good. In there I found an on/off toggle switch and a 10amp reset button. The toggle was switched to "off" position. Now I swear to you that I have never been inside this compartment and 3 weeks ago the heat worked fine. But when I switched the toggle to "on", the **** thing kicked on like the day it was installed. I went in and tested the thermostat and it's working perfectly. What I cannot explain is how that toggle could have been switched to the off position. Absolute mystery. And I feel like an ******* for wasting all of your precious time. Thank you for trying to help. I guess the lesson is a reminder to check the easy stuff first.