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The OEM Goodman 0130F00038 auxiliary limit switch is a color-coded (light blue) secondary over-temperature safety control used on Goodman and Amana furnaces such as the ACSS961205DNAA. Mounted near the blower or coil section, it backs up the primary limit by opening the control circuit if temperatures in that zone exceed the safe threshold — protecting the blower housing and downstream components. The light-blue body identifies its specific factory trip rating, so matching color and part number is important.
The color-coded OEM switch guarantees the correct trip temperature for this position in the furnace. Generic limits without the matching rating can nuisance-trip or fail to protect. For a safety device, always match the OEM color and part number.
Moderate — Disconnect power, remove the access panel, transfer the two spade leads, and screw the new switch into the original location in the same orientation. Confirm the replacement is the light-blue rating before installing.