Insure that your RV is plugged in. The electric part of the water heater will only work when you plug your RV in to shore power (or run on generator if you have one). It will not work on 12v, you have to have 110V A/C. Also check to be sure that all your circuit breakers are on.
Karl - Southeast, NY
2020 377 RLBH
2018 Ram 3500 Mega Limited 6.7L Cummins w/ Aisin