If there is low suction into the heat exchanger, the flames will start “rolling out” from the heat exchanger. Most flame rollout switches look like a little metal circle with two wires coming out of the back.ĭuring normal furnace operation, the flames from the burners will be sucked into the heat exchanger. The rollout switch is located on the side or top of the burner compartment. The flame rollout switch is used to detect if there is a fire or hot exhaust gases inside of your furnace’s burner compartment. Flame rollout switch versus high limit switch: What’s the difference?.What causes a flame rollout switch to trip?.What to do when your flame rollout switch keeps tripping.