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The Goodman 0130F00038 Auxiliary Limit Switch (identified by its light-blue housing) is a genuine OEM safety control for the AMVM960603BXBA gas furnace and compatible Goodman & Amana models. This thermally activated cutout monitors temperature at a secondary location in the furnace and opens the control circuit if it detects an overheat condition — protecting the heat exchanger, blower assembly, and surrounding cabinet from damage caused by restricted airflow or a failed blower.
OEM limit switches are calibrated to the exact trip and reset temperatures engineered for this furnace. Generic substitutes with mismatched setpoints can either nuisance-trip during normal operation or, worse, fail to open when they should. Because this is a safety device, we strongly recommend the genuine OEM part.
Easy (2/5). Usually held by two screws with quick-connect terminals. Cut power at the disconnect first, and note the color/position of each wire before removal. A quick swap for most technicians.