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The Goodman 10123529 is a genuine OEM manual reset high-limit switch for the ACES800403ANAA furnace and compatible models. This thermal safety device opens the heating circuit if it detects an overheat condition — typically from restricted airflow or a failed blower — protecting the heat exchanger and home from damage. Because it is a manual-reset type, it must be physically reset (and the root cause cleared) after a trip, making it a true last-line safety control.
The OEM 10123529 is factory-calibrated to the furnace's exact trip temperature and matches the original mounting footprint and terminal type. Generic switches with the wrong trip point can nuisance-trip or, worse, fail to protect the heat exchanger. For a safety control, only OEM-spec calibration should be trusted.
Easy — Disconnect power, unplug the two spade terminals, remove the mounting screws, and install the new switch in the same orientation. Allow 15–30 minutes. Always diagnose why the original tripped before returning the furnace to service.