It is 15 degrees and I tried to turn on my propane as I wanted to do some work on the inside of the camper and the propane will not work on either tank. Could the regulator be frozen?
I think the real problem is when a bottle is ran empty, it needs to be evacuated again before it is refilled. Any moisture in the mixture can freeze in the regulator. I had it happen once with my Daughter was 1 year old, in a pop up camper one night when the temps unexpectedly dropped into the lower 30's.
It was not a defective regulator, after it thawed in sun next day it never did it again.