The propane system powers the fridge (when not powered by electricity), stove, furnace, and water heater.
Open the first outside hatch on the left side of the RV and turn the gray knob all the way to the left to send propane into the system. On the fridge, set the switch to AUTO and it should begin to cool automatically. The furnace will run if you turn on the AC and set it to “Furnace” and set the temperature. The water heater will turn on if you flip the second switch to the top left on the panel below the countertop right in front of the cabin door.