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The Goodman 10123535 Manual Reset Limit Switch (Red) is a genuine OEM safety control for the Goodman GKS90904CXAE 90%+ AFUE gas furnace. The red button designates a distinct trip-temperature calibration used at a specific location in the burner/rollout circuit. When excessive heat or flame rollout is detected, the switch opens the gas control circuit and locks out until manually reset.
The color coding on Goodman limit switches corresponds to specific temperature ratings — installing the wrong one compromises safety. This genuine OEM 10123535 red switch guarantees the correct trip point and location match, avoiding the nuisance trips or unsafe operation common with mis-rated generic substitutes.
Easy (2/5). With gas and power off, note the wiring, remove the mounting screws, transfer the spade connectors, and reset the button. Confirm the switch matches the red-coded original and diagnose the root cause of any trip before restarting.