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The Goodman 10123533 Manual Reset Limit Switch is a genuine OEM safety control for the Goodman GKS90904CXAE 90%+ AFUE gas furnace. This high-limit / rollout switch monitors for dangerous overheating or flame rollout and opens the gas circuit to shut the burner down. Because it is a manual-reset device, it stays tripped until physically reset — alerting you to an underlying issue rather than silently cycling.
Limit switches are life-safety devices calibrated to a specific trip temperature. An incorrectly rated generic switch can allow unsafe operation or cause nuisance shutdowns. The genuine OEM 10123533 is factory-calibrated to the exact temperature and amperage spec for the GKS9 platform.
Easy (2/5). Shut off gas and power, note the wire positions, unscrew the mounting bracket, transfer the spade connectors, and press to reset. Always diagnose the cause of a trip before returning the furnace to service.