Originally Posted by machandler82
The tank heater switch has an led light just like the water pump switch. However when it is turned on the light is not lit, does it only light up when it is actually heating the tanks?
Forest River FR3 2018
So do you actually have the tank heaters? I know it sounds terrible to ask you, but they may not be installed on your options with your RV. Sometimes I have seen switches installed with nothing attached.
Secondly if you know it was an option and you have it, you may have a connection not connected. It would be very unlikely that the LED is burnt out or the led isn't connected. I would say if they are there, that a connector or wire is loose underneath. Sounds link you'll need to take a few things apart to start searching or testing continuity through he system.