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The Goodman 10123533 Manual Reset Limit Switch is a genuine OEM high-temperature safety control for the AMH950703BXAF gas furnace. This normally-closed switch opens the control circuit and shuts down the burners if it detects an overheat or flame-rollout condition, then requires a manual press of the reset button to restore operation — a deliberate safety feature that flags a problem instead of silently short-cycling.
The OEM switch is calibrated to the exact factory trip temperature and terminal orientation for this furnace. Generic limit switches with the wrong set point can nuisance-trip on normal cycles or, worse, fail to protect against a genuine overheat. Because this is a life-safety component, matching the OEM trip rating is strongly recommended.
Easy (approx. 10–15 minutes). Disconnect furnace power, unplug the two spade terminals, remove the mounting screws, install the new switch in the same orientation, and reconnect. Reset the button and confirm normal burner operation. If the new switch trips again, investigate the underlying overheat cause (dirty filter, blocked flue, weak blower) before repeated resets.