Furnace Not Heating: Thermocouple vs. Flame Sensor Issues 99042: Revision history

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29 December 2025

  • curprev 18:5118:51, 29 December 2025‎ Hithimxdsg talk contribs‎ 19,223 bytes +19,223‎ Created page with "<html><p> When a furnace refuses to heat, the temptation is to picture a catastrophic failure. In many homes, though, the problem comes down to a simple safeguarding part that either stopped sensing flame correctly or stopped telling the gas valve it was safe to stay open. On older standing-pilot furnaces, that part is the thermocouple. On modern direct-ignition furnaces, it is the flame sensor. Both exist to prevent burning gas without flame, but they work differently a..."
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