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The Goodman 10123519 is a genuine OEM manual-reset high-limit switch for the AMH951155DXAA gas furnace. This safety control opens the ignition circuit if the heat exchanger or plenum exceeds its rated temperature — protecting against overheating from restricted airflow, a dirty filter, or blower failure. Because it is a manual-reset design, it requires a physical button press to restore operation after a trip, prompting a technician to diagnose the root cause.
The OEM Goodman switch matches the factory trip temperature and mounting footprint for the AMH951155DXAA, ensuring the furnace's safety chain behaves as designed. Generic limits may differ in trip point or bracket dimensions. For a temperature-safety device, OEM specification is strongly recommended.
Easy — cut power, remove the two mounting screws, transfer the spade terminals, and reinstall. Confirm the reset button is fully engaged and test for continuity before restoring heat.