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The Goodman 0130F00038 Auxiliary Limit Switch (light-blue coded) is a genuine OEM secondary safety control engineered as a direct-fit replacement for the AMEC800805CNAA furnace and compatible Goodman and Amana models. This auxiliary limit adds a redundant layer of over-temperature protection, typically guarding the blower compartment or a secondary section of the heat exchanger. If temperatures exceed its rated setpoint, it opens the control circuit and shuts down heating to prevent component damage or a fire hazard.
OEM vs. Generic: The genuine OEM 0130F00038 carries the exact trip temperature indicated by its light-blue color band, matched to your furnace's design. Substituting a generic limit or the wrong color-coded switch can trip too early or too late, causing nuisance lockouts or defeating a critical safety function. Always match the OEM color rating on limit controls.
Installation difficulty: Moderate. Plan on 15–20 minutes with a nut driver. De-energize the furnace at the disconnect, note the wiring orientation, and transfer the leads to the new switch. Verify the color code matches the original before installing, and test furnace operation afterward. When in doubt about a safety control, consult a licensed HVAC technician.