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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM high-limit safety control for the Goodman ACVC80805CXBD gas furnace. This switch monitors temperature in the heat exchanger / burner area and opens the circuit to shut down the furnace if it overheats — protecting against cracked heat exchangers, blocked airflow, and fire. As a manual-reset device, it stays tripped until physically reset, alerting the homeowner that an overheat condition occurred and needs attention.
Limit switches are calibrated to a specific trip temperature. The genuine Goodman 10123529 opens at the exact set point Goodman engineered for the ACVC80805CXBD, so the furnace trips when it should and not prematurely. A generic switch with the wrong cut-out temperature can either nuisance-trip or, worse, fail to protect against a real overheat. For a life-safety control, always use the OEM-spec part.
Cut power at the breaker, disconnect the two spade terminals, remove the mounting screws, and install the new switch in the same orientation. Do not bypass or jumper a tripped limit switch — if it keeps tripping, have the root cause (airflow, heat exchanger) diagnosed by a professional.