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The Goodman 10123533 Manual Reset Limit Switch is a genuine OEM high-limit safety control engineered for GKS90904CXAA gas furnaces and compatible Goodman/Amana heating systems. When furnace temperatures exceed the safe operating threshold, this switch opens the circuit to shut down the burner, protecting the heat exchanger and blower assembly from damage. Because it is a manual reset device, it requires a technician to press the reset button after a fault, alerting the homeowner that an underlying issue such as restricted airflow or a dirty filter needs attention.
OEM vs. Generic: This is the factory OEM part, guaranteeing exact trip-temperature calibration and terminal placement for your furnace. Aftermarket generic limit switches may cost less but can carry incorrect temperature ratings, risking nuisance shutdowns or, worse, failure to protect the heat exchanger. For a safety-critical component like a limit switch, we strongly recommend OEM.
Install Difficulty: Easy — most technicians replace this in 15–20 minutes. Always disconnect power before service. If you are not comfortable working around gas or electrical components, hire a licensed HVAC professional.