You can get the service manual off the HWH website, get that and go through the troubleshooting routine, that'll isolate the problem. If it's just the control pad, those aren't expensive (in the HWH scheme of things), I might hot-swap and send the old one in to get rebuilt at their leisure. Which may take a while, but then you'll have a spare, or something to sell on ebay to recoup.
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2021 DRV Santa Fe 44
2024 Chevy 3500 dually
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