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Ask.why is my lennox g12 series furnace blowing cold air and not hot air even though the pilot light is on and the blower is blowing

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Apparently you have everything you need except fuel for the pilot to light so I would look to discover why the fuel is not getting to the unit. Since it is critical from a safety stand point I recommend you request the assistance of a professional Heating Service man.

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The Lenox might be having a problem with its heat sensitive sensor or its connection is wrong. The best thing to do is to call an electrician to fix for you or try fixing it for yourself.

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