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The Goodman B1401018S Hot Surface Ignitor is a genuine OEM ignition component for the GUS125-5 gas furnace. The hot surface ignitor (HSI) glows to light the main burners on every heat call, making it one of the most frequently replaced furnace wear items. Symptoms of a failing ignitor include no ignition, delayed light-off, or a furnace that cycles on the flame-sense lockout. This factory-spec part restores fast, dependable startup.
OEM vs. Generic: The genuine B1401018S ships with the correct bracket, gasket, and factory connector so it seats and wires up exactly like the original. Universal ignitors require splicing pigtails and re-mounting, adding failure points and install time. Because the ignitor is directly in the ignition-safety chain, OEM fitment gives you the most reliable, warranty-safe repair.
Install Difficulty: Easy (1 of 5). Turn off gas and power, unplug the old ignitor, remove one or two mounting screws, and reverse for the new part. Avoid touching the ceramic element with bare fingers — skin oils shorten its life. Most installs take 15–20 minutes.