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The Goodman 10123529 is a genuine OEM manual reset high-limit switch, a direct-fit safety control for the GMPE075-3 gas furnace and other compatible Goodman/Amana models. This normally-closed thermal switch opens the control circuit if it senses excessive heat — such as from a blocked heat exchanger, dirty filter, or failed blower — shutting the furnace down to prevent overheating. Because it is a manual reset design, it must be physically reset with the button after a trip, alerting the homeowner to an underlying condition that needs attention.
This is a safety-critical component, and the trip temperature is calibrated to Goodman's furnace design. Genuine OEM switches guarantee the correct open/reset set point, whereas generic substitutes may trip early or — more dangerously — trip late. Always use the OEM 10123529 for combustion safety devices.
Easy to Moderate — disconnect power, remove the two spade connectors, and replace the switch. Never bypass or jumper a manual reset limit switch; if it trips repeatedly, diagnose the root cause.