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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM high-limit safety control for Goodman and Amana gas furnaces, including the AMEH800805DXAA. This switch opens the circuit to shut the furnace down if it senses an overtemperature or flame-rollout condition, protecting the heat exchanger and surrounding components. Because it is a manual-reset device, it requires a physical reset after tripping — signaling the technician to diagnose the underlying cause.
The OEM 10123529 is calibrated to the exact trip temperature specified for this furnace and uses the correct terminal and mounting configuration. Generic limit switches with incorrect trip points either nuisance-trip or, worse, fail to protect the unit. For a safety control, OEM is the only recommended choice.
Rating: Easy to Moderate — DIY-capable, but diagnose first. Cut power, disconnect the two leads, unbolt the switch, and install the replacement in the same orientation. Important: a tripped limit is a symptom — check airflow, filters, and blower operation before returning the furnace to service.
Authentic Goodman safety part. Confirm the part number and model before ordering.