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The genuine OEM Goodman 10123533 is a manual reset flame rollout / high-limit safety switch engineered for the Amana AMH950703BXAC 96% AFUE gas furnace and compatible Goodman/Amana furnace platforms. When the burner box or heat exchanger area exceeds its safe temperature threshold, this switch opens the ignition circuit and shuts the furnace down, protecting the equipment and your home from overheating. Because it is a manual reset device, it will not automatically re-close after a fault — a technician must press the reset button, which prompts a proper diagnosis before the furnace runs again.
The genuine OEM 10123533 is calibrated to the exact trip temperature and mounting footprint specified by Goodman, so it seats correctly and trips at the factory setpoint. Aftermarket "universal" limit switches often use approximate cutout temperatures and different bracket geometry, which can cause nuisance lockouts or, worse, fail to trip at the correct point. For a safety component, we recommend the OEM part.
Rated Easy (2/5). Cut power at the disconnect, remove the two mounting screws, transfer the spade connectors, and reinstall. Always identify the root cause of a tripped rollout switch (blocked flue, cracked heat exchanger, dirty burners) before resetting — this switch is a symptom indicator, not just a part to replace.