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The Goodman 20269903 Auxiliary Limit Auto-Reset Switch is a genuine OEM high-limit safety control for the WGGE4336A070MAB gas furnace. This normally-closed thermal switch opens the control circuit if it senses excessive heat—typically from restricted airflow or a failed blower—then automatically resets once temperatures return to a safe range. It is a critical safety device that prevents heat-exchanger and cabinet overheating.
Limit switches are safety-rated to a specific trip temperature. This Goodman OEM switch is calibrated to your furnace's exact cutout point, unlike universal switches that may trip early (nuisance shutdowns) or late (unsafe). For a safety component, OEM is strongly recommended.
Easy–Moderate (2/5). Disconnect power, remove the two spade connectors, unbolt the switch, and reverse. Confirm the replacement is the same trip rating before installing.