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My furnace is short cycling what would cause this?

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Funace runs fine for 10 min. then the burner drops out , reset power does same thing checked pressure switch cleaned flame sensor checked main limit seems ok

On 2013-03-20 JB wrote:

First, I would suggest looking to see if you are getting an error code. This would point to a source of the problem if not the cause.

Other causes could be a dirty filter not allowing proper air flow or a blocked duct or register. It could also be an issue with the thermostat in that it could be faulty or even improperly placed. You could also have a dirty blower wheel.

On a more serious note, the furnace could be overheating and a safety feature is shutting it down. It seems you have checked a few things that may cause this, but it could also maybe be a crack in the heat exchanger or some other issue you haven't yet found.

It would probably be a good idea to bring in a certified HVAC tech to do a diagnostic.

To keep legal happy, let me just say that I am not an HVAC contractor, and you should never even look at your furnace without having a qualified, liability accepting HVAC contractor present.  To keep sales happy, let me just say that you can find an HVAC contractor that's happy to take your money here: http://www.furnacecompare.com/perl/find_contractors.pl.

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