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This genuine OEM Goodman auxiliary (rollout/blower-compartment) limit switch is a direct-fit replacement for the WFD195090S4CAB gas furnace. Identified by its light-blue body marking, this thermal safety switch monitors temperature in the auxiliary compartment and opens the control circuit if it detects an overheat condition — protecting the heat exchanger and surrounding components from damage.
The OEM switch is factory-calibrated to the exact trip temperature Goodman specifies for this furnace — the safest, most reliable choice. A Generic equivalent matches the physical footprint and closely matches the trip point at a lower price. For a safety-critical limit switch, OEM is strongly recommended to preserve the correct cut-out temperature.
Easy (2/5). Disconnect power, remove two mounting screws, transfer the two spade connectors, and reinstall. Match the color/temperature rating exactly. Typical install time: 15–20 minutes.