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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM safety control for the ADSS801005CXAA gas furnace and compatible Goodman/Amana models. Unlike an auto-reset limit, this manual-reset switch latches open when it trips on excessive temperature — typically from flame rollout or a blocked heat exchanger — and must be physically reset by pressing its button, alerting the homeowner or technician that a serious fault occurred. This design meets furnace safety-circuit requirements and helps prevent unsafe repeat cycling.
OEM vs. Generic: The genuine 10123529 is calibrated to Goodman's exact trip temperature, terminal spacing, and mounting bracket. Because this is a safety component, a mismatched generic switch can trip at the wrong temperature or fail to latch, defeating the protection it provides.
Install Difficulty: Easy — cut power, unplug the two spade terminals, remove the mounting screws, and install the new switch. About a 15-minute job; after replacing, diagnose why the original tripped before returning the furnace to service.