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The OEM 10123533 manual reset limit switch is a factory safety component for the Goodman GMH950704CXAF gas furnace. This high-limit / rollout switch opens the control circuit and shuts the furnace down if it detects excessive temperature — typically caused by a blocked flue, dirty filter, failed blower, or flame rollout. Because it is a manual-reset device, it will not auto-restart, forcing a technician to inspect the cause before the furnace can run again. That deliberate lockout is what keeps a small problem from becoming a fire hazard.
Limit switches are calibrated to a specific trip temperature and mounting footprint. The genuine Goodman 10123533 matches the factory temperature rating and bracket exactly, ensuring the furnace shuts down at the correct threshold. Generic switches with a different set point can either trip prematurely or fail to protect the equipment. For a safety-critical part, always choose OEM.
Easy (2/5) — Remove the two mounting screws, transfer the wire terminals, and mount the new switch in the same orientation. About 15 minutes. Cut power and gas first, and always diagnose why the original tripped before returning the furnace to service.