Sump boxes are a huge pain in the ass. If you have to replace it, get the one that has clips for removing the lid, not the kind that requires removing screws. Can't recall if it's a Rule or an Atwood, but it's one of the two. Given the mess than can accumulate in the sump you want to be cleaning it out on a regular basis. The mold and slime that can grow in there is just nasty. Best to stay ahead of it.
Meanwhile it's likely to be the switch, the pump or the wiring connections. Start by manually fiddling with the float switch (assuming it's separate from the pump). The the wiring. Check that power is present by using a volt meter. The float switches and pumps are known to fail, regardless of brand. Just seems to be more of a consumable maintenance item that you might first think.
And note that if you use a lot of soap it's possible for the suds to keep the float from working properly. This leads to the sump getting too full and the pump not keeping up. Which, in turn, may cause the water to back up out of the sump, usually overflowing into the AC unit collection pan.
Yet another fun surprise about how boating isn't quite the same as being at home. Plumbing, electrics, etc, each with a few limitations that aren't always obvious.
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