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The Goodman 10123535 Manual Reset Limit Switch is a genuine OEM red-button high-temperature safety cutoff for the Goodman/Amana AMH950904CXAF gas furnace. The red manual-reset button distinguishes it from similar limit switches by trip temperature and mounting location. When the furnace exceeds its safe operating temperature, the switch opens the burner circuit and locks out until manually reset — protecting the heat exchanger and preventing unsafe overheating.
This switch is set to a specific cutout temperature that differs from the companion 10123533 — confirm you are ordering the correct part for your furnace position. The OEM 10123535 guarantees the right trip point and terminal layout. Generic substitutes risk incorrect calibration on a safety-critical control, so OEM is recommended.
Easy — Disconnect the spade terminals, remove the mounting screws, and install the replacement in the same orientation. About 15 minutes for most DIYers. Clear any airflow restriction that caused the trip before restarting.
Turn off power and gas before servicing.