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This genuine OEM Goodman 10123535 red manual reset limit switch is a high-temperature flame rollout / safety control for the GMH950904CXAB gas furnace. The distinctive red button identifies it as the higher-temperature rollout-protection switch, mounted near the burner assembly to detect flame rollout or excessive burner-area heat. If combustion gases spill out of the burner box — often due to a blocked flue, cracked heat exchanger, or inducer problem — the switch trips and locks out the furnace to prevent fire and unsafe operation. It must be manually reset, signaling that a serious condition needs professional inspection.
OEM vs. Generic: Rollout switches are a life-safety component with a precise factory trip temperature. The red 10123535 and the standard 10123533 are not interchangeable — using the wrong color/rating defeats the furnace's layered safety design. Always match the exact OEM part for this position.
Install Difficulty: Moderate (3/5). Shut off gas and power, remove the burner-area cover, unscrew the switch, transfer the leads, and reinstall. Because a tripped rollout switch indicates a combustion issue, have a qualified technician diagnose the root cause before returning the furnace to service.