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The Goodman 10123529 is a genuine OEM manual-reset rollout limit switch built for the VMS80603ANAA 80% gas furnace and compatible models. This normally-closed thermal safety switch mounts near the burner box and opens the ignition circuit if flame rollout or overheating is detected, shutting the furnace down to prevent a fire or heat-exchanger damage. Because it is manual reset, it requires a physical button press to restore operation after a trip — a deliberate design that flags an underlying combustion problem.
The OEM 10123529 is calibrated to Goodman's exact trip temperature and reset threshold, so the furnace's safety response matches factory specifications. Generic equivalents may trip at incorrect temperatures, causing nuisance shutdowns or, worse, failing to trip when needed. For a safety component, OEM is strongly advised.
Power off the furnace, unplug the two spade terminals, remove the mounting screws, and install the new switch in the same orientation. A repeated trip after replacement indicates a rollout or heat-exchanger issue that must be diagnosed by a technician.