I found it - jayflight thermal package limit
This weekend, I made a strategic decision. Nature showed me that this was a bad decision. I have a 2014 jayflight with the thermal package. We camped in sub freezing temps (15 F as the low at night, 37 daytime high). About 1:00 in the morning I learned the fresh water tank had started to freeze. The pump couldn’t pick up water. I switched to pulling water from a jug using the pump and the water line normally used for antifreeze. During the next day, the tank thawed midday and then froze again the next night. Also, the gray water tank also froze. The black tank did not. No pipes froze (that I found....fingers crossed).
So, now we know where the limit is. Lesson learned. And hopefully not one that shows itself later with cracked components. It was a very “light” freeze and so I am hoping we have been spared by physics.
2014 Jayco JayFlight 29QBH
2012 Ford F-250 Lariat crew cab 6.7L diesel
Honda 3000 is inverter generator
Biggest Weber fan in the world.