Mine wasn't working... didn't work all last season (2016)...I changed out the element thinking that would fix it. But no luck.
So spring 2017 I decide to change the two thermostats and the switch.
And that did it! Didn't have to refill my propane tanks once...and that's with 51 nights camping!
During the work, my best guess is that it was a faulty thermostat as one (or both) had some plastic rot (brittle and chipping).
Hope this helps!
Luke & Carolyn
2012 Cedar Creek Silverback 35QB4
2013 Sierra 3500HD Duramax CC SRW SB 4x4
Andersen Ultimate Aluminum 2 Gooseneck Mount