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This genuine OEM Goodman primary high-limit switch (part #20162903) is a direct-fit replacement for the Goodman GCH950904CXAB gas furnace. This safety-critical control opens the gas circuit if the plenum air temperature exceeds its 150°F trip point, protecting the heat exchanger and blower housing from overheating caused by restricted airflow, a dirty filter, or blower failure.
A failed or drifting limit switch is a frequent cause of short-cycling, no-heat lockouts, and repeated blower runaway. Replacing it with the correct factory-rated switch restores reliable, code-compliant overheat protection.
The OEM Goodman limit switch is calibrated to the exact 150°F trip point and mounting footprint engineered for this furnace. Because this is a safety device, a generic switch with a different set point can allow dangerous overheating or cause premature nuisance trips. Always use the OEM-rated part.
Easy–Moderate (2/5). Shut off power and gas, remove two mounting screws, disconnect the two wire terminals, and swap in the new switch. Takes about 15–20 minutes. Verify correct orientation against the heat-exchanger opening.