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The Goodman 0130F00038 Auxiliary Limit Switch (Light Blue) is a genuine OEM safety control designed for the Amana/Goodman AMEH800603BNAB gas furnace. This auxiliary high-limit switch monitors temperature at a secondary location within the furnace and opens the control circuit if it senses an overheat condition, shutting down the burners to protect the heat exchanger and blower housing from thermal damage.
The color code (light blue) corresponds to a specific trip temperature rating, so it is important to install the exact matching switch. A failed or nuisance-tripping limit switch commonly causes no-heat calls, short-cycling on the high limit, or a furnace that will not fire at all. Replacing it with the correct OEM part restores normal, safe operation.
As a temperature-calibrated safety device, the OEM Goodman switch guarantees the correct trip point and reset behavior for this furnace. Generic or mismatched-color substitutes may trip early, trip late, or fail to protect the heat exchanger properly — a risk not worth taking on a safety component. Choose OEM for exact factory calibration.
Easy (1/5). Typically held by two screws with push-on spade terminals. Disconnect power before servicing and confirm the color/temperature rating matches the original. A quick job for most DIYers; consult a licensed technician if unsure.