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The Goodman 0130F00010S is a genuine OEM flame sensor (flame rod) for the GMN120-5 gas furnace and compatible Goodman/Amana models. The sensor uses flame rectification to confirm the burner has lit; if it fails to detect flame, the control board shuts the gas valve within seconds and locks out. A dirty, cracked, or failed flame sensor is the #1 cause of a furnace that lights briefly then shuts off (short-cycling).
The OEM sensor matches Goodman's exact rod length, bend, and insulator so the microamp signal falls in the control board's expected range. Generic sensors may read low and cause intermittent lockouts. Given the low cost, OEM is recommended for reliable ignition.
Easy — 10 to 15 minutes. Turn off power, remove one screw, unplug the wire, and swap. Avoid touching the rod with bare fingers; clean or replace at each annual service.