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The Goodman 0130F00036 Limit Switch (identified by its pink housing) is a genuine OEM high-limit safety control for the AMEC961205DNAA gas furnace. Mounted on the heat-exchanger bulkhead, this thermal switch continuously monitors supply-air temperature and opens the circuit to shut off the burners if the furnace overheats — for example, during a dirty-filter or blower-failure condition.
The color code (pink) corresponds to a specific factory trip temperature, so it is critical to match the exact part rather than substituting a differently-rated switch. An open or drifted limit switch typically shows up as a furnace that fires, heats briefly, then locks out, or one that will not fire at all if the contacts have failed open.
Generic limit switches may look identical but carry different trip and reset set points. Installing the wrong rating can cause nuisance lockouts or, worse, fail to protect the heat exchanger. The OEM pink 0130F00036 is calibrated to Goodman's exact specification for this model.
Easy to moderate. Cut power to the furnace, remove the two mounting screws, transfer the wire terminals to the new switch, and remount. Always confirm the color/rating matches the original before installing.