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This genuine OEM Goodman 10123533 manual-reset limit (flame rollout) switch is a critical safety control on the GKS90453BXAD gas furnace. Mounted near the burner box, it senses abnormal heat caused by flame rollout — typically from a cracked heat exchanger, blocked flue, or restricted combustion air — and opens the gas-valve circuit to shut the furnace down. Because it is a manual reset device, it will not automatically re-close, forcing a technician to inspect the cause before restoring heat.
The OEM switch carries the correct factory trip temperature and reset behavior matched to this furnace's burner geometry. Generic limit switches with the wrong setpoint can nuisance-trip or, worse, fail to protect against a genuine rollout event. For a life-safety component, use OEM.
Easy (2/5). Disconnect power and gas, unplug the two spade terminals, remove the mounting screws, install the new switch, and reconnect. Always diagnose why the original tripped before replacing.