My forced hot air system works fine until it has to heat the house more than 4 degress. It works when you put it on but after a 10 minutes or so it starts to blow cold air. OR after reaching the tempature setting of say 66 degees its keeps running and cold air comes out dropping the temp in the room. If you wait an hours or so then put it back on the whole process starts over again. Heat come on then a after 10 minutes its cold air again.
any idea what this could be.
this is a forced hot air system, the unit is a trane that is 17 years old. it heats the second floor and is in the attic.
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