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The Goodman 10123517 is a genuine OEM manual reset high-limit switch engineered specifically for the AMH950905CXAC gas furnace. This safety control opens the burner circuit if the heat exchanger area exceeds its rated temperature, protecting the furnace from overheating due to restricted airflow, a failed blower, or a dirty filter. Because it is a manual reset device, it requires the homeowner or technician to press the reset button after a trip — a deliberate design that flags a recurring overheat condition rather than silently cycling.
Our OEM Goodman switch ships with the exact factory calibration temperature and terminal orientation for the AMH950905CXAC — critical for a safety device, since an incorrectly rated aftermarket limit can trip early or, worse, fail to protect the heat exchanger. A generic universal limit may fit physically but often carries a different cutout temperature. For a safety component we strongly recommend OEM.
Easy (2/5). Cut power at the disconnect, disconnect the two spade terminals, remove the mounting screws, swap in the new switch, and reconnect. Most techs complete this in under 15 minutes. If the switch keeps tripping after replacement, investigate airflow — a tripping limit is usually a symptom, not the root cause.