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Tried to turn on my furnace this morning and got a code flashing on my Coleman Evcon unit. It is three flashing lights that indicate Combustion Air Switch failed to close.

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  • timone1221 Oct 20, 2008

    I tried turning mine on as well and it's flashing three times. It worked earlier with my father's help, but I don't know what he did! lol

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  • 182 Answers

Check for a blocked flue pipe

Posted on Oct 02, 2008

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