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Search Results for: Gas Furnace Repair Pilot light won't stay lit

What Is the Most Common Reason for a Furnace Not Working?

By Keith Schneerer / October 3, 2026

Check the air filter before you call anyone. A clogged filter tripping the furnace’s internal safety switch is the number one cause behind furnace not working complaints — more common than a bad igniter, a dead thermostat, or a gas valve problem. Swapping the filter itself is usually a $15

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