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The Goodman 20261709S Hot Surface Ignitor is a genuine OEM igniter built for the GMPE100-4 gas furnace. The hot surface ignitor (HSI) glows to light the main burners each heating cycle, and it is the single most common no-heat failure point in a modern furnace. A cracked or worn ignitor causes no-light lockouts and short-cycling — this OEM replacement restores dependable first-try ignition.
The genuine Goodman ignitor arrives with the correct 120V element rating, bracket geometry, and factory plug, so it drops in without splicing. Generic silicon-nitride replacements can work but often need harness adapters and vary in flame-position alignment, which affects reliable light-off. For your primary ignition component, OEM is worth it.
Easy — usually one mounting screw and an unplug/re-plug of the connector, 15–20 minutes. Cut power first, and avoid touching the fragile element with bare fingers.
Genuine OEM Goodman part. Confirm plug style and bracket against your existing ignitor.