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The genuine OEM Goodman 10123537 is a manual reset high-limit safety switch engineered for the Amana/Goodman AMVC950905DXAD 95% AFUE variable-capacity gas furnace and compatible models. It monitors heat-exchanger and plenum temperature and opens the ignition circuit if the furnace overheats, protecting the equipment and your home from a runaway thermal condition. Because it is a manual-reset design, it will not automatically re-close after a trip — a technician must inspect the cause and press the reset button, giving you an added layer of safety over auto-reset controls.
Aftermarket limit switches often use loose trip-temperature tolerances that cause nuisance shutdowns or, worse, fail to open at the correct threshold. This genuine OEM control is factory-calibrated to Goodman's exact trip and reset specification, ensuring reliable overheat protection and preserving your equipment warranty. When it comes to a safety device, matching the OEM spec is not optional.
Rating: Easy (2/5). A two-wire spade-connector swap that most experienced DIYers can handle in 15–20 minutes. Always shut off gas and 120V power at the disconnect before servicing. If the switch has tripped, diagnose the root cause — restricted airflow, dirty filter, or blower fault — before returning the furnace to service. When in doubt, call a licensed HVAC technician.