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The Goodman 10123529 is a genuine OEM manual-reset high-limit switch designed for the WGFD28090V5CXAA gas furnace and compatible Goodman/Amana units. This safety control opens the ignition circuit if temperatures exceed the rated trip point, protecting the heat exchanger and cabinet from overheating due to restricted airflow or blower failure.
OEM limit switches are calibrated to the exact trip temperature specified for this furnace. Generic substitutes with incorrect trip ratings can either nuisance-trip or, worse, fail to shut down during a genuine overheat event. For a safety-critical control, OEM is strongly recommended.
Easy — Cut power to the furnace, unplug the two spade terminals, remove the mounting screws, and install the replacement. A repeatedly tripping limit indicates an underlying airflow or combustion problem that should be diagnosed before returning the unit to service.