Perhaps a fault in the electric heating element or a thermostat that’s failed. What happens when you switch over to propane? If it works normally on propane then I’d suspect the element as the bad actor.
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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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