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The Goodman 0130F00038 is an auxiliary (secondary) limit switch engineered as a direct-fit replacement for the Goodman ADSS801005CXAB gas furnace. Identified by its light-blue body, this thermal safety device provides backup overheat protection — commonly mounted near the blower compartment to open the control circuit if temperatures exceed safe limits, guarding against airflow blockages and blower failures.
The color-coded OEM switch is calibrated to Goodman's exact trip temperature for this location in the furnace. Installing the wrong-rated generic switch can cause premature tripping or reduce the safety margin. Match the light-blue OEM part for correct, reliable protection.
Easy — Two screws and push-on terminals in most cases. Shut off furnace power first, and use a multimeter to confirm the switch has opened before replacing.