furnace ignites and shuts off after 20 seconds

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  #1  
Old 02-04-06, 10:00 PM
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furnace ignites and shuts off after 20 seconds

I have a Carrier plus 80 gas furnace installed in 1997. The igniter heats up and the gas comes on and it ignites, but then it only runs for 20 seconds and shuts off. Then the blower runs for a few minutes and the cycle strts all over again. The problem indicator says is it is an ignition proving failure. I think I need to clean my flame sensor, but I don't know what it looks like or how to clean it properly.

After i cleaned the flame sensor, the furnace ignited and the blower came on, but the furnace only ran for about 3 minutes and a new problem indicator light came on. It is the "limit or flame roll-out switch is open". I have changed the filters because it says that it could be from dirty filters. But, I continue to have the problem.
 

Last edited by pablot; 02-04-06 at 10:39 PM. Reason: I fixed the flame sensor problem
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  #2  
Old 02-04-06, 11:12 PM
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Originally Posted by pablot
the "limit or flame roll-out switch is open"
Did you try to reset it/them?

They might be at opposite corners of the burner area nearest you.


Did you have the guard in place?
Do you forget to put something back after you cleaned the sensor?

That you are having successive failures is a bad sign.
 
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Old 02-05-06, 05:38 AM
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You very well could have a dirty/clogged or even cracked heat exchanger. You really should get this thing cleaned and safety inspected by a pro.
 
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Old 02-05-06, 02:26 PM
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Use anylon pad for cleaning dishes and clean the flame senser. Fallow the white wire to the sensor left burner. 1/4" screw Pull it out and clean it. Do not use sand paper you will need anew one.
 
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Old 02-05-06, 03:02 PM
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One thing that wasn't mentioned in the original post, is this natural gas or propane fired? If it's propane fired, it could be a supply problem.
 
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Old 02-05-06, 08:22 PM
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Originally Posted by hankhill6018
One thing that wasn't mentioned in the original post, is this natural gas or propane fired? If it's propane fired, it could be a supply problem.
It is a gas furnace.
 
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Old 02-06-06, 10:08 PM
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Just so you don't think we dropped the ball on this...

There are some questions for you in reply #2.
 
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