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Furnaces

Cold air, short cycling, flame sensors, pilot lights and blink codes.

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HeatCoolFix is a repair guide for the machines that heat and cool a home: furnaces, air conditioners, heat pumps, mini splits, thermostats and water heaters. One fault per page, checked in the order a technician checks it.

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Newest guides

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How this site works

Every guide is a fault, not a product review. The steps are in the order a technician checks them, and the parts and numbers come from the makers’ own manuals.

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© 2026 HeatCoolFix Gas, refrigerant and mains wiring work belongs to a licensed technician. When a step says stop, stop.