Furnace Not Heating Because of Flame Sensor: Cleaning Guide: Revision history

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29 December 2025

  • curprev 17:5417:54, 29 December 2025‎ Botwinguvm talk contribs‎ 19,988 bytes +19,988‎ Created page with "<html><p> Cold living room, thermostat set correctly, blower running, but no heat. If your gas furnace tries to fire and then shuts down a few seconds later, the flame sensor has probably stopped doing its job. That slender metal rod with a ceramic base sits in the burner flame and tells the control board the fire is stable. When it gets covered in oxidation or soot, it can’t “see” the flame, so the board cuts gas as a safety measure. You end up with a furnace not..."
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