Staff Answer
Sep 28, 2026 - 06:18 AM
The 619154 thermocouple threads into the gas valve (or the interrupter, on models that have one) at one end, and its tip sits in the flame at the burner. To check it, heat the tip in the flame and measure the output with a millivolt meter. A weak or zero reading means it's bad. If it won't stay lit even with a good thermocouple, the 628119 wire kit often fixes N300s.
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