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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM high-limit safety control engineered for the WGGE4549A115MAA gas furnace. This switch continuously monitors the temperature around the heat exchanger and opens the burner circuit if the furnace overheats — a common result of a dirty filter, a failing blower, or restricted airflow. Because it is a manual reset design, it will not automatically restart after a fault, forcing a technician to inspect the root cause before the furnace can run again. That extra step is a deliberate safeguard against repeat overheating and heat-exchanger damage.
This is a true Goodman OEM component with a factory-calibrated trip point matched to your furnace's heat-exchanger geometry. Generic aftermarket limit switches are cheaper but may trip at the wrong temperature — nuisance shutdowns if set too low, or inadequate protection if set too high. For a safety-critical control, we recommend the OEM part to preserve the original certification.
Easy (1/5). Two spade terminals and two mounting screws. Always disconnect power and shut off the gas before servicing. If the switch has tripped, diagnose and correct the underlying airflow or blower fault before resetting.