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The Goodman 10123535 red manual reset limit switch is a genuine OEM thermal safety control for GKS90905DXAA gas furnaces and compatible Goodman/Amana models. The distinctive red button identifies it as a manual reset device with a specific trip point — commonly used as a flame rollout or auxiliary high-limit safety. If flames roll out of the burner box or the heat exchanger overheats, the switch opens, de-energizes the gas valve, and stops the furnace until a technician diagnoses the cause and presses reset.
The OEM part guarantees the correct trip temperature and bracket — critical because the red and non-red switches in this furnace are NOT interchangeable. The Generic version matches the same rating at a lower price for out-of-warranty units. Always verify the color and part number against the one you are removing.
Easy (2/5). Power off, remove the mounting screws and spade terminals, install the replacement, and reconnect. A repeated trip means fix the rollout or airflow root cause before returning to service.