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The Goodman OEM 10123535 Manual Reset Limit Switch (Red) is a factory-original high-temperature safety cutout for the AMVC950453BXAA gas furnace and related Goodman/Amana models. The red-bodied switch denotes its specific trip-temperature rating and monitors a designated zone of the burner or heat-exchanger area, opening the 24V control circuit to stop combustion when unsafe heat is sensed. Its manual-reset design ensures a fault is acknowledged by a person before the furnace can restart.
The color coding on the OEM 10123535 corresponds to a factory-set trip temperature — a detail generic switches frequently get wrong. Installing an incorrectly rated substitute can cause premature nuisance trips or, worse, failure to cut out when needed. Genuine Goodman calibration removes that guesswork.
Moderate. Power down the furnace, open the burner compartment, unclip the two wire terminals, and swap the switch on its bracket. Typical time is 15–20 minutes. When in doubt, have a licensed HVAC professional perform the replacement.