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Furnace Just Blows Cold Air
My furnace just blows cold air. I checked on thermostat. There is
nothing wrong. I took off the panel on furnace and pushed white button. The two green Led Indication Lights are on with(DS1-- Slow flash, a flash/per second, DS2--on). According to the label on the panel it means "primary/secondary limit switch open". I have no clue what it means and what the problem is. I notice there is no gas coming out and the electronic ignition does not turn red. But It blows cold air. My furnace model is Lennox Merit Series G40UH-69D-155-01. It was installed Apr. 2001. Here are my questions. 1) What is the possible problem? 2) What does "primary/secondary limit switch open" mean? 3) Is it still under warranty? The Lennox website says "5-Year Limited Warranty on covered components." Thanks in Advance. Shiling |
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