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Water heater A/C circuit breaker and DC fuse
There will be a circuit breaker for the water heater on the A/C breaker panel in your trailer. Your water heater element is probably fried, so to be safe make sure this breaker is in the "off" position before plugging your trailer into shore power. I use this breaker to control the A/C part of the water heater rather than the small rocker switch on the water heater itself. Keeping this breaker off insures that the DW can't accidentally turn the electrical element of the water heater on when its winterized.
Of course, the water heater could still be destroyed by someone turning it on using propane while it is empty. BTW, there is also a DC fuse that can be pulled to prevent this from happening, but that fuse might also control the refrigerator control board. Just pull one DC fuse at a time until the water heater won't fire up, and then check to see if the fridge will still come on.
As always, YMMV!
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