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The Goodman 20269903 Auxiliary Limit Auto-Reset Switch is a genuine OEM secondary safety control for WGGE4336A090MAB gas furnaces. This auxiliary limit provides an additional layer of overheat and flame-rollout protection beyond the primary high-limit, opening the control circuit to shut down the burners if abnormal heat is detected at its mounting location.
Because it is an automatic-reset device, it closes again once temperatures return to normal — but repeated tripping indicates an underlying problem such as restricted airflow, a dirty filter, a failing blower, or a cracked heat exchanger that must be diagnosed. Replacing a worn or drifted auxiliary switch restores dependable safety response.
Auxiliary limits must trip at a precise temperature to be effective. Off-brand equivalents may use a loose tolerance or different disc rating. This OEM Goodman 20269903 is matched to the factory trip point and terminal layout, so it drops in without rewiring and delivers the exact protection the furnace was certified with.
Disconnect power, unplug the two spade terminals, remove the mounting screws, and install the replacement in the identical position and orientation. Never bypass a safety switch — have a licensed HVAC professional confirm proper operation after service.