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The Goodman 10123529 manual reset limit switch is a genuine OEM safety control designed for VMES800603AXAA gas furnaces and compatible Goodman/Amana models. This high-limit switch monitors heat-exchanger and rollout temperatures and cuts power to the gas valve if the furnace overheats — protecting against blocked airflow, failed blowers, or flame rollout. Unlike auto-reset switches, the manual reset design requires a technician to press the reset button, ensuring a fault condition is inspected before the furnace restarts.
The OEM Goodman 10123529 is factory-calibrated to the exact trip temperature Goodman engineered for this furnace. Generic limit switches may trip early (nuisance shutdowns) or, worse, trip late — a serious safety risk. For a life-safety component, always use the OEM part.
Replacement involves disconnecting power, removing two mounting screws, transferring the spade connectors, and mounting the new switch in the same orientation. If the switch keeps tripping after replacement, investigate the root cause — dirty filter, blocked vent, or failing blower. Have a licensed HVAC professional diagnose repeated limit trips.