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Thanks. I opened the door to the furnace to see if the pilot light was on and the furnace turned itself off (some sort of safety switch). When I put the door back on, the whole thing fired up and...

Hi. I have a natural gas furnace that's about 7 years old, in a house I just bought this summer. Today I was noticing that it was pretty cold, so I turned up the furnace. It went on, but after a...