There are a couple of potential reasons that the main would trip. It would probably result in more confusion than it is worth. However I will suggest that since you probably don't have the means to test the existing HWH circuit breaker I would suggest replacing it. They are about $5 and it would be the best $5 you ever spent even if it turns out the original was fine. You will just have a spare.
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SOB
2015 Volvo VNL780 D13, iShift, 32k ET air hitch, Idle Free LiFePO4 APU
16.8KWhr LiFePO4, 2.52 kw solar, 10kva Victron split phase
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