First, Welcome to JOF. You'll find lots of help here.
Sounds like it used to work on gas, how about electric when plugged into campground power? Have you checked fuses? Perhaps most important, still under warranty?
I'm guessing yours is an Atwood WH - there's a small 2amp fuse on the circuit board that you see when opening the outside panel that may be the problem.
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2019 Pinnacle 36 FBTS
2016 Silverado 3500 CC SRW DuraMax/Allison
1975 Corvette for the sunny days n dry roads
2017 RZR for the rainy days n muddy roads
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