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The Goodman 0130F00038 is a genuine OEM auxiliary limit switch, identified by its light-blue marking, engineered as a direct-fit replacement for the WGFD28070V3BXAA gas furnace and compatible Goodman/Amana models. This normally-closed thermal safety switch opens the control circuit if it senses excessive temperature, protecting the furnace and home from overheating due to restricted airflow, a failed blower, or a clogged filter.
Because a limit switch is a safety device, the trip temperature must match your furnace exactly. This factory OEM Goodman switch is calibrated to the correct cut-out point and color-coded so you install the right rating. Substituting a generic switch with the wrong trip temperature can cause nuisance shutdowns or, worse, defeat the overheat protection.
Easy — Cut power, disconnect the two spade terminals, remove the mounting screws, and install the replacement in the same location and orientation. A 15-minute job; always confirm the airflow problem that tripped the original switch has been resolved.