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My Carrier gas furnace (ser. 1903A41848) located in the attic, is five years old and suddenly won't light. IT cycles the fan when I cycle the power to the unit and seemingly attempts to ignite through 3 auto-attempts, (I can smell the gas), yet no continuous operation with heat occurs afterwards. Two lights exist on the exhaust vent both begin green yet one turns red after the ignition attempt. Please let me know your thoughts. -Doug

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The igniters bad or if unit ignites the flame sensor is bad try this first

Posted on Jan 04, 2009

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Try the fuse ,check the ignition element .do You have a drip leg on your gas supply line just before the gas pipe enters the furnace .if not your gas valve maybe folded .

Posted on Jan 04, 2009

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Hi i have a york diamond heater in my attic. I went up in the attic and revomed the grill and the four burners are not coming on. it clicks and u smeal gas but it will shut off. the little blower motor...


If your furnace uses an electrical glow element to light the pilot light, the Glow Element will need to be replaced. Glow Elements are general used on 90+ High Efficiency Gas Furnaces.

If it uses a standing pilot light rather than the Electrical Glow Element, you need to manually relight the pilot. Since I can't see your furnace, you will need to locate and read your Owners Manual on how to do this or look in the side or inside the pilot light compartment for instructions on how to light it.
Be sure you have stick match or a butane grill lighter with you before you try to light it.

If it's a manual pilot ... if after lighting it, it doesn't hold when turned to the ON position, more thank likely you'll need to have the Thermocouple replaced.

And above all, BE CAREFUL. If you don't feel comfortable lighting a gas furnace, call a professional.

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If the burners do not fully ignite, the sensor will shut the furnace down. The lack of sufficient burner flame is a gas valve or gas pressure problem within the valve.
Replacing the gas valve with the original one may get you going. I surely suggest a professional service company for safety reasons and a thorough inspection. A 20 year old furnace is past it's normal life span.

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Your old stat is wired for a traditional thermostat and not a communication stat like the new infinity you have. There is a module plug on the furnace board that will need to be connected to the new thermostat for it to work. The wires that are wired now are from a terminal strip inside the furnace. Please contact your local Carrier dealer. They may be able to get that harness for you

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