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The 10123535 is a genuine OEM red-button manual-reset limit/rollout switch for the Goodman GME950805CXAB gas furnace. The distinctive red reset button identifies this switch's specific factory trip temperature, which differs from the companion 10123517. It is a normally-closed safety control that opens the ignition/gas-valve circuit on an overtemperature or flame-rollout event, protecting the heat exchanger and occupants from unsafe operation. As a manual-reset device it will not automatically re-close, so the unit stays locked out until a technician clears the underlying fault.
The red-button calibration is not interchangeable with other-colored switches — installing the wrong trip point defeats the safety design. Generic rollout switches rarely match Goodman's exact set point. This genuine OEM switch guarantees the correct calibration and terminal geometry for a direct, safe fit.
Access the burner compartment, transfer the two wire leads, and remount the bracket in the original position. De-energize power and shut off gas before starting. Recommended for HVAC technicians or confident DIYers.