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The Goodman 10123519 is a genuine OEM manual reset high-limit switch designed for the AMH951155DXAC gas furnace. This safety component monitors heat-exchanger and plenum temperatures and interrupts the burner circuit if the furnace overheats — protecting the equipment and your home. Because it is a manual-reset device, it must be pressed to restore operation after a trip, alerting you to an underlying airflow or venting problem.
The OEM 10123519 is calibrated to the exact trip temperature specified for this furnace. Generic limit switches may have different setpoints or mounting footprints, risking nuisance trips or, worse, a switch that fails to open at the correct temperature. For a safety cutout, always use the factory-rated part.
Easy. Two wire terminals and a mounting screw. Turn off power before servicing. If the switch keeps tripping after replacement, diagnose airflow, filter, and venting issues before running the furnace.