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The 0130F00038 light-blue auxiliary (secondary) limit switch is a genuine OEM safety control for the Goodman/Amana ADVC80805CXBA gas furnace. Mounted in the blower or secondary heat zone, it provides a backup over-temperature cutout that shuts down the furnace if abnormal heat is detected outside the primary limit's coverage. The light-blue color code identifies its specific trip temperature for the auxiliary position.
The auxiliary limit has a different calibrated setpoint than the primary — that is why it carries a distinct light-blue code. Substituting a generic switch or the wrong color can defeat the furnace's layered safety design. Use the genuine OEM part to ensure the correct trip temperature and terminal layout for your ADVC80805CXBA.
Easy (2/5). Secured by two screws with two spade terminals. Disconnect power first, swap wires one at a time, and confirm the switch seats flush against its mounting surface.