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The Goodman 10123529 is a genuine OEM manual-reset limit switch (thermal safety cutout) for the WFM18070S3AXCC gas furnace. This switch opens the control circuit and shuts down the burners if it senses an over-temperature or flame-rollout condition — protecting the heat exchanger and household from unsafe operation. Because it is a manual reset, it will not automatically restore power once tripped: a technician must press the reset button after diagnosing the cause. Repeated tripping usually points to restricted airflow, a dirty filter, or a blocked flue.
Safety limit switches are calibrated to a specific trip temperature matched to this furnace's heat exchanger. Installing a generic switch with the wrong setpoint can cause nuisance trips or, worse, fail to protect the unit. Always use the OEM-specced part for any combustion safety control.
Moderate — Two-wire swap held by a bracket or screws, roughly 15–25 minutes. Shut off gas and power, note wire orientation, and confirm the switch seats flat against its mounting surface for accurate sensing. Never bypass a limit switch.