Wavery and all -
Not to be fussy, but the issue of a failed water heater element tripping a GFI,
but not tripping a circuit breaker or blowing a fuse, is a bit more complex than a simple short, because it does not involve an overload or high current. It is discussed in detail here
https://www.trailmanorowners.com/for...ead.php?t=8101
and has worked every time the issue of GFI-but-not-circuit breaker has come up.
Kory, I'm not sure where you heard about this, but I'm glad you brought it forward. The explanation is a bit more complicated than most folks care to wade through, but it is accurate.
Anyone who is finding that a GFI in a campground or garage is tripping, even when all the breakers in the TM are turned off, should at least read the intro to the writeup. It can save a lot of frustration and wasted work.
Bill