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The Goodman 10123533 is a manual-reset high-limit / rollout safety switch for the GME950603BXAB 96% AFUE gas furnace. It is a normally-closed thermal cutoff that trips and interrupts the ignition circuit if it senses an over-temperature or flame-rollout condition — protecting the heat exchanger and cabinet. Because it is manual-reset, a tripped switch requires pressing the reset button after the underlying cause (blocked airflow, dirty filter, or cracked heat exchanger) has been corrected.
Genuine Goodman limit switches are calibrated to the exact trip temperature and mounting footprint specified for this furnace. A generic switch with the wrong temperature rating can nuisance-trip or, worse, fail to protect against a real overheat. For a safety device, always use the OEM-rated part.
Easy. Cut power to the furnace, disconnect the two spade terminals, remove the mounting screws, and install the new switch in the same orientation. Always diagnose why the original tripped before returning the furnace to service.