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The Goodman 10123517 is a genuine OEM manual-reset high-limit switch built for the Amana/Goodman AMH950905CXAA gas furnace. This thermally-activated safety device opens the control circuit and shuts the furnace down if it senses an over-temperature or flame-rollout condition, protecting the heat exchanger and surrounding cabinet from heat damage. Because it is a manual reset device, it stays open until physically reset — a deliberate design that forces a service check after a fault.
The OEM Goodman switch is matched to the exact trip temperature and bracket footprint your furnace requires, so it seats correctly and trips at the engineered set point. A Generic substitute can work for the same role at a lower cost but may differ in temperature rating or mounting tab orientation. For a safety cutoff, OEM is the safer choice.
Easy (1 of 5). With power off, unplug the two spade terminals, remove the mounting screws, and install the replacement in the same orientation. Takes about 10 minutes. If the switch had tripped, always diagnose the root cause (blocked flue, cracked heat exchanger, dirty filter) before returning the furnace to service.