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The Goodman 20269903 is a genuine OEM auxiliary limit switch with automatic reset, built for the WGGE4330A070MAB gas furnace and compatible models. This secondary safety switch provides an extra layer of over-temperature protection beyond the main limit — typically guarding the blower compartment or a secondary heat zone. When it senses excess heat it interrupts the control circuit, then re-closes automatically once temperatures return to normal. If your furnace intermittently loses heat and then recovers on its own, a weak auxiliary limit is a likely culprit.
The OEM Goodman switch guarantees the correct trip and reset temperatures for this furnace platform. Generic auto-reset switches with mismatched set points can cause nuisance heat loss or fail to protect the cabinet. For safety circuitry, choose OEM.
Easy (1/5). Mounts with one or two screws and connects via spade terminals. Cut power, photograph the wiring, swap the switch, and restore. Typically under 15 minutes.
Disconnect power before servicing. Persistent tripping after replacement points to an airflow or blower issue — have it inspected.