If it's an Atwood heater, there is a reset button on most of them. You will have to gain access to the furnace, find that red rocker switch, turn it off then back on. The furnace in my old TT was buried under the sofa and some luan paneling. I'd verify there is voltage at that fuse before I'd go further.
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2018 28BHBE
2017 Ford F250 XLT, 6.2 gasser
2013 26BH (traded)
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