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The 10123529 is a genuine Goodman manual reset high-limit safety switch for the GCG300360EBXXXAA furnace and compatible Goodman/Amana gas units. This is a critical safety component: it opens the control circuit and shuts down the burners if it senses an over-temperature or flame-rollout condition, protecting the heat exchanger and preventing unsafe operation. Because it is a manual reset device, a tripped switch signals a real fault (blocked airflow, dirty filter, or cracked exchanger) that should be investigated before pressing reset.
Limit switches carry a calibrated trip temperature tied to the furnace's safety certification. The OEM 10123529 matches the exact cutout point and mounting footprint. Generic switches with different trip temps can nuisance-trip or, worse, fail to protect — for a safety device, OEM is strongly recommended.
Easy (2/5). Disconnect power, unplug the two spade terminals, unscrew the switch, and mount the replacement in the same orientation. Diagnose the root cause of any trip before returning the furnace to service.