We have the F-5 waterer from this page in our field:
http://www.franklinwaterers.com/cattle.html
A few days ago, after a cold and blowy day, I found that it wasn’t filling. The heater works and the trough part isn’t frozen. The float thing is moving. But water doesn’t come up.
I am really, really hoping the water line isn’t frozen, but I don’t know enough about these waterers to know what to check to narrow it down to that. The line and the waterer were installed by a local well guy with a good reputation, so I’d be surprised if it’s a simple issue like the waterline not deep enough.
Ideas?