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The Goodman 0130F00038 Auxiliary Limit Switch (light blue) is a genuine OEM thermal safety cutout for the AMH80803BNBD gas furnace. This normally-closed rollout/auxiliary limit opens the control circuit if it detects abnormal heat — such as a blocked flue, failed blower, or restricted airflow — shutting the burners off to prevent heat-exchanger and cabinet overheating. The light-blue body color denotes its specific factory trip temperature.
The OEM 0130F00038 is calibrated to the exact trip temperature the AMH80803BNBD was designed around — indicated by the light-blue housing. Installing a switch with the wrong temperature rating can allow unsafe operation or cause nuisance trips. Because this is a safety device, always match the OEM color/temperature code exactly.
Easy. Two spade terminals and a bracket screw. Cut power and gas, note wire positions, swap the switch, and confirm continuity/reset. Verify the correct trip temperature before energizing. 10–15 minutes for most.