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With a gas furnace (or water heater), what does the color of the flame indicate?

April 26, 2017color flame furnace Gas indicate

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With a gas furnace (or water heater), what does the color of the flame indicate?

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A. If the system is operating properly, the flame should have a bluish color. A yellow flame indicates a need for adjustment and should be checked by a qualified service person as soon as possible.