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The Goodman 0130F00038 Auxiliary Limit Switch (light-blue coded) is a genuine OEM secondary safety control for AMVM970603BNAA modulating variable-speed gas furnaces. Positioned near the blower or secondary heat exchanger, this auxiliary limit provides an additional layer of overheat protection beyond the primary limit — opening the control circuit and shutting off the gas valve if it detects abnormal heat buildup, typically from restricted return airflow or a stalled blower. The color code (light blue) identifies its specific factory trip temperature, so matching the exact part is essential.
The light-blue color code exists precisely because trip temperature matters. This genuine OEM switch guarantees the correct set point for your furnace's secondary safety loop — installing the wrong-temperature generic can defeat the protection this circuit is designed to provide.
Easy (DIY-friendly). Two push-on terminals and one or two mounting screws — roughly a 10-minute replacement. Disconnect power and gas, note the wiring, and confirm the color code matches the switch you remove before installing.