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The Goodman 10123538 manual reset limit switch is a genuine OEM overheat safety control for VMES961005CNAA modulating gas furnaces. This normally-closed thermal switch opens the ignition/blower control circuit if the heat exchanger or cabinet exceeds its safe temperature threshold, shutting down the burners to protect the furnace and your home. Because it is a manual reset device, a trip requires a physical button press to restore operation — an intentional design that flags a persistent airflow or overheating fault for inspection.
The Genuine OEM 10123538 is calibrated to the exact trip temperature specified for this furnace platform. Aftermarket limit switches may carry a different set point, which can cause nuisance trips or, worse, fail to cut out when needed. For a safety-critical component, we recommend the OEM part.
Rating: Moderate (3/5). Requires disconnecting furnace power, removing the burner/control panel, transferring the two spade terminals, and remounting to the heat exchanger bracket. Basic hand tools needed. If the switch keeps tripping after replacement, diagnose the underlying airflow restriction — do not bypass the limit.