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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM safety control for the VMES800805CXAA gas furnace and compatible Goodman/Amana models. This normally-closed, temperature-sensing switch opens to shut off the burners if it detects an overtemperature or flame-rollout condition, protecting the heat exchanger and cabinet. Because it is a manual reset device, it must be physically reset after a trip — and a switch that trips repeatedly signals an underlying airflow or combustion problem that should be diagnosed.
This is a genuine OEM Goodman safety switch calibrated to the exact factory trip temperature. Generic switches with the wrong set point can nuisance-trip or, worse, fail to trip when needed. For a life-safety component, always use OEM and never bypass a limit switch.
Easy. Cut power at the disconnect, disconnect the two spade terminals, unscrew the switch from its bracket, and mount the replacement in the same location. About 10–20 minutes with basic tools. After install, address the root cause of any prior trip before returning the furnace to service.
Verify compatibility with your model and serial number before ordering.