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The Goodman 0130F00038 Auxiliary Limit Switch (light-blue color-coded body) is the genuine OEM secondary thermal safety for the ACES800804BXAA gas furnace. The auxiliary limit provides backup over-temperature protection — commonly mounted near the blower or rollout area — and shuts off the burners if heat builds up where the primary limit can't sense it. Its light-blue color code marks a distinct factory trip-temperature from the primary (pink) limit.
OEM vs. Generic: The light-blue auxiliary limit is calibrated to a specific setpoint that differs from the primary limit — they are not interchangeable. Installing the wrong color or a generic switch can leave the furnace without proper backup protection or cause nuisance lockouts. The OEM 0130F00038 is the exact, correctly calibrated part.
Install Difficulty: Easy (1/5). Two mounting screws and two spade terminals — roughly 10–15 minutes. Disconnect power before working on the unit.