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The genuine OEM 0130F00010S flame sensor confirms the presence of a burner flame in your Goodman WFM18140S5DNCB furnace. Using flame rectification, the sensor rod passes a tiny microamp current through the flame back to the control board; if no flame is detected within the trial-for-ignition window, the board shuts off gas for safety. A dirty, cracked, or worn flame sensor is one of the most common causes of furnace short-cycling and ignition lockout.
Flame sensor rod length, ceramic insulator quality, and positioning determine how consistent the flame-current signal is. The OEM Goodman sensor is built to the exact factory geometry for a stable microamp reading. Lower-cost generics can produce a weak or erratic signal that leads to intermittent lockouts. Given how often this small part is the root-cause fix, OEM reliability pays off.
Easy (2/5). Turn off power, remove the single mounting screw, unplug the sensor wire, and install the replacement. Avoid touching the rod with bare fingers. Roughly a 10-minute repair — one of the simplest and most rewarding furnace fixes.
Tip: cleaning a lightly fouled sensor with fine abrasive pad can restore function, but a pitted or cracked rod should be replaced. Help: info@nationalhvacparts.com.