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The Goodman 0130F00038 Auxiliary Limit Switch (light blue) is a genuine OEM secondary overtemperature safety control for AMES920403ANAA gas furnaces and compatible Goodman/Amana models. Mounted near the blower or burner compartment, this auxiliary limit protects against secondary overheating conditions the primary limit may not catch — such as blocked airflow or a stuck blower. The light-blue body color identifies its specific trip rating, so matching the exact part is important.
The genuine OEM switch guarantees the correct trip temperature indicated by the light-blue color code. Substituting a generic or wrong-color switch can defeat the intended safety threshold, causing either nuisance trips or dangerous late shutoffs. Always match OEM for safety devices.
Easy (DIY-friendly). Two mounting screws and two spade terminals. De-energize the furnace at the breaker first. Verify the replacement color matches the original before installing.