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The 10123533 is a genuine OEM manual reset limit (rollout) switch for the Goodman/Amana AMH950905DXAB gas furnace. This normally-closed thermal safety device opens the control circuit and shuts down the burners if it detects excessive heat or flame rollout at the burner box — protecting the furnace and home from overheating. Unlike auto-reset limits, it requires a manual button press to reset, ensuring a technician inspects the cause before the furnace restarts.
The OEM switch is calibrated to the exact trip temperature specified for the AMH950905DXAB. Because this is a life-safety component guarding against flame rollout and overheating, using the factory part with the correct temperature rating is critical — a mismatched generic switch can trip prematurely or, worse, fail to trip when it should.
Moderate (2/5). Turn off power and gas, remove the burner-compartment panel, unplug the two spade terminals, unscrew the switch, and mount the replacement. A 15–20 minute job; if the original switch had actually tripped, have a technician diagnose the underlying overheating cause first.