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Old 12-13-2011, 07:43 PM   #1
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Carrier Furnace Error Code 34 Comfort 80


I have read as much as I can on here and other places about these codes. The furnace igniter glows 2 out of the 3 burners start, but the 3rd doesn't. This doesn't not happen every time. If we turn the switch on the side on and off (after lock out) it starts and attempts again. The 3rd will light after a few attempts and rarely locks out. But why is this happening? It seems all other things are functioning properly. I have read to clean the igniter with sand paper or steel wool and/or clean the burner out. Should this fix it?

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Old 12-13-2011, 07:47 PM   #2
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Carrier Furnace Error Code 34 Comfort 80


Not the ignitor. Clean the flame sensor.


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Old 12-13-2011, 07:58 PM   #3
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Carrier Furnace Error Code 34 Comfort 80


Burners are dirty. The cross overs aren't letting enough gas go through them, thats why the third burner doesn't light. Need pulled and cleaned.
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Old 12-13-2011, 08:50 PM   #4
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Carrier Furnace Error Code 34 Comfort 80


We will try this as soon as the boys go to bed.
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Old 12-30-2011, 04:48 AM   #5
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Carrier Furnace Error Code 34 Comfort 80


OP, hope you had luck with your furnace issue. Can anybody advise how to find the flame sensor on the Carrier Comfort 80? I've never worked on a furnace before. Thanks in advance.
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Old 12-30-2011, 09:08 AM   #6
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Carrier Furnace Error Code 34 Comfort 80


Generally speaking, flame sensors are locate in front of the burner rack, opposite of the ignitor.

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