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The Goodman 10123529 is a genuine OEM manual reset high-limit switch for the Goodman ADSS800603AXAC gas furnace. This safety control monitors heat exchanger temperature and cuts power to the gas valve if the furnace overheats — protecting against cracked heat exchangers, blocked airflow, and fire hazards. Unlike an auto-reset limit, the manual reset button requires a technician to physically reset the switch, ensuring the underlying fault (dirty filter, failed blower, blocked vent) is addressed before the furnace fires again.
The genuine OEM 10123529 is factory-set to the exact trip temperature specified for your heat exchanger. Generic limits with the wrong set point either nuisance-trip (no heat) or fail to trip (safety risk). For a safety-critical control, always use the OEM-rated part.
Easy (2/5). Disconnect power, unplug the two spade terminals, remove two mounting screws, and install the new switch in the same orientation. A 10-minute job. Reset the button after installation and test a full heating cycle.
If the limit trips repeatedly after replacement, diagnose the airflow or blower issue — do not bypass a safety switch.