Limit switch


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Old 02-08-15, 08:23 PM
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Limit switch

It seems as though the limit switch in he burner area of my furnace is "open". What causes this? Not sure what type of furnace it is but the house is only appx 10 years old. If I push the little red reset button in the middle, the furnace will operate again until it gets too hot (I'm assuming) and tripping the switch. What could cause more heat than normal or could it be a weak switch? Thank you very much...



Chris
 
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Old 02-08-15, 08:54 PM
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Welcome to the forums.

That switch you are describing is the flame roll-out safety stat. It means the flames are not being contained within the burner chamber and is a problem that needs to be addressed ASAP.

You should be able to see the flames extending out of the burner area. You may have a problem with the heat exchanger or a blockage in the exhaust flue.
 
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Old 02-08-15, 08:57 PM
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Can you post a picture of the area housing the limit?
 
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Old 02-09-15, 04:58 PM
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Had a tech out today to look at it, he's leaning towards a heat exchanger problem. I will post a pic as soon as I can.
 
 

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