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The Goodman 0130F00038 Auxiliary Limit Switch is a genuine OEM high-limit safety control designed for the Goodman ADSH800804BXAB gas furnace and compatible models. Identified by its light-blue housing, this normally-closed thermal switch opens the control circuit if the heat exchanger or blower compartment exceeds a safe temperature, protecting the furnace from overheating.
This is a factory OEM Goodman part, calibrated to the exact trip temperature your furnace's control board expects. Generic aftermarket limit switches may carry a different trip point or reset behavior, which can cause nuisance lockouts or, worse, fail to protect the heat exchanger. For a safety component, we recommend the OEM switch.
Easy — Typically a two-wire, one- or two-screw replacement. Disconnect power at the breaker, note the wire positions, swap the switch, and restore power. Most homeowners can complete this in 10–15 minutes, though we recommend a licensed HVAC technician for any gas-appliance service.