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The OEM Goodman 10123535 is a red-button manual reset limit / flame rollout switch designed for the AMS950453BXA furnace and related Goodman/Amana models. The distinctive red reset button typically identifies a rollout switch mounted near the burner assembly, where it detects flames rolling out of the burner box due to a blocked flue, cracked heat exchanger, or restricted combustion air. On a fault it cuts power to the gas valve, stopping the furnace to prevent unsafe operation.
The genuine OEM 10123535 is calibrated to the precise trip temperature Goodman specifies for this furnace's rollout location. Substituting a generic switch with a different rating can cause dangerous no-trip conditions or false shutdowns. For flame-rollout protection, always use the correct OEM part.
Easy (1/5). Remove two screws, transfer the wire leads, and mount the new switch. Turn off gas and electrical power first. A rollout switch that keeps tripping signals a serious combustion problem—stop using the furnace and call a licensed technician.