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The Goodman 0130F00038 Auxiliary Limit Switch (Light Blue) is a genuine OEM secondary high-limit safety control for the Goodman ADSH800603AXAA furnace. As an auxiliary limit, it provides an additional layer of over-temperature protection — often mounted on the blower deck or near the electronics — to shut down the furnace if heat migrates outside the primary heat-exchanger zone. The light-blue color code identifies its specific trip rating within the Goodman limit lineup.
Auxiliary limits are calibrated to a distinct trip point identified by the light-blue code. Substituting a generic or mismatched-rating switch can defeat the intended protection or cause false lockouts. This OEM part guarantees the exact factory calibration and fit for the ADSH800603AXAA.
Moderate — Disconnect power, locate the auxiliary limit (commonly on the blower housing or panel), unscrew it, and transfer the leads. Verify the light-blue rating matches. If you are not comfortable with furnace electrical work, use a qualified HVAC technician.