My furnace Carries model 58 pav ,run on and off every 10 minutes,anybody know what is wrong with it please help?thanks

Dirty filter,windows open,bad thermostat,ghost turning thermostat up and down?

Hi,thanks for help.Anyway,I just change a new thermostat and filter I used the one (wash off a dirty and reused it... I forgot what is it call for but I wash it at this summer)but I do not understand what you said : windows open (windows in the house?) and ghost turning thermostat up and down?Any chance that wrong because of A FLAME SENSOR?THANKS

Unscrew the screw that holds the flame sensor in place and take the sensor out and clean the metal wire part with a piece of sand paper and replace. It may work better.

I did it already,I'm thinking to change a new one(flame sensor).Before I change it just want to make sure I do a right thing.Thanks

Is there a status light on the furnace? If so, it will lead to the problem.

A red light just stay on red all the time ,it does not blinking at all.thanks

Sounds like the thermostat may be the problem. The status light should blink if the furnace malfunctions.