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The 10123529 manual reset limit switch is a genuine OEM high-temperature safety control for the Goodman/Amana AMS80403AXAD gas furnace and compatible models. This normally-closed switch opens the control circuit and shuts down the burners if it senses an over-temperature or flame-rollout condition — most often caused by a blocked flue, dirty filter, failed blower, or cracked heat exchanger. Because it is a manual reset device, it will not re-close on its own after tripping, forcing a technician to inspect the cause before the furnace can restart. That makes correct OEM replacement essential to the furnace's safety chain.
Generic limit switches may carry a different trip temperature or terminal orientation, which can allow unsafe operation or nuisance shutdowns. The genuine 10123529 is calibrated to Goodman's exact cut-out setpoint and mounting footprint — do not substitute a switch with a different rating on a combustion safety device.
Moderate (3/5). Two spade terminals and one or two mounting screws, but the underlying cause of a trip must be diagnosed first. Cut power before servicing; a licensed HVAC technician is recommended.