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The Goodman 10123529 is a genuine OEM manual reset high-limit switch for AMVC81005CXCA and compatible Goodman/Amana gas furnaces. This safety control opens the burner circuit if the furnace overheats — typically from restricted airflow or a failed blower — and must be manually reset once the fault is cleared, alerting the homeowner that service is needed.
The OEM switch is calibrated to the furnace's exact trip temperature and bracket footprint. Generic limits may trip at the wrong setpoint — nuisance shutdowns if too low, or an unsafe delay if too high. For a life-safety component, always match OEM specifications.
Easy. Power off the furnace, unplug the two spade terminals, unscrew the switch from its mounting, and install the replacement in the same orientation. About 15–20 minutes with a nut driver. If the switch trips again after reset, diagnose the airflow problem before returning the furnace to service.