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The air returns to the furnace as cooler air. The furnace burner looks like a row of tubes in which the correct amount of air and fuel mix in order to burn effectively. Your Coleman furnace also has two high temperature limit switches to protect it from overheating by turning off the power to the ignition controlling the gas valve.. Feb 29, 2020 · 3. Your Furnace Is The Problem. Your furnace could also be the cause of the problem. The switch inside the furnace could have accidentally been switched off, so be sure the power is turned on. Even if you have a gas system, it uses electricity and must be turned on. There is a power disconnect switch by the furnace..