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The Goodman 10123529 is a genuine OEM manual-reset limit (rollout) switch for the VMS80403ANAA gas furnace. This safety control opens the gas-valve circuit if it senses abnormal heat or flame rollout at the burner box, shutting the furnace down to prevent overheating. Because it is a manual-reset device, it must be physically reset after a trip — and a switch that trips repeatedly signals an underlying combustion or airflow problem that should be diagnosed.
The genuine Goodman OEM switch is calibrated to the furnace's exact trip temperature and terminal configuration. Generic switches with the wrong set-point can nuisance-trip or, worse, fail to protect the equipment — never substitute a different temperature rating on a safety control.
Moderate (2/5). A straightforward electrical swap. Shut off power and gas, remove the two spade connectors and mounting screws, install the new switch, and reconnect. Typical time: 15–25 minutes. If the switch tripped, diagnose the root cause before returning the furnace to service.