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The Goodman 0130F00038 Auxiliary Limit Switch (Light Blue) is a genuine OEM safety component for the ACEC960603BNAA furnace and compatible Goodman/Amana models. This normally-closed thermal switch opens the control circuit if the cabinet or blower compartment exceeds a safe temperature, shutting off the burners to prevent overheating. A tripped or failed auxiliary limit is a common cause of no-heat and intermittent shutdown faults.
The OEM switch is calibrated to the exact trip and reset temperatures the furnace was engineered for — critical for a safety device. Generic substitutes with the wrong temperature rating can either nuisance-trip or, worse, fail to open when needed. Match the light-blue color code to guarantee the correct calibration.
Easy — two-screw mount with quick-connect terminals. Cut power before servicing. A quick 10–15 minute replacement; verify the cause of any prior trip (restricted airflow, dirty filter, failed blower) to avoid repeat failures.