I just had the same problem happen while i was camping in Blueridge GA. My issue ended up being the control card that had become corroded on the bottom of the circuit board. Ended up changing the card. There is a reset logic switch near the control card that can be switched off and then back to reset. Make sure you place the switch back into reset as it does not spring return (I found this out after additional troubleshooting because the card changeout didn’t work initially!). Remember, start with the simplest solution to the problem and work out from there. Oh, BTW there is a fuse that feeds the circuit board. Make sure its still good.
2016 Keystone Montana
2019 3500HD Dually Silverado