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My burners come on and stay on,blower fan is running,does not heat house,continues to drop temp approx 1 degree 9-10 hrs, burners and fan run continueousely, I HAVE CHANGED AIR FILTER, WHAT THE PROMBLEM, HEAT EXCHANGER? NEW FURNACE? FURNACE IS APPROX 14 YRS OLD. NEVER BEEN A PROBLEM
