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The Goodman 20162903 Primary Limit Switch is a genuine OEM safety control rated at 150°F for the GKS90703BXAD gas furnace. Mounted on the heat exchanger or plenum, it continuously monitors supply-air temperature and shuts off the burners if the furnace overheats — protecting the heat exchanger and preventing unsafe operation.
A limit switch is a life-safety device — its trip point must match the furnace design exactly. This OEM 150°F switch is calibrated to Goodman's specification. A generic switch with the wrong temperature rating can either nuisance-trip (no heat) or fail to trip when it should (overheating and cracked heat exchanger). Match the OEM rating every time.
Moderate (2/5). Two mounting screws and two spade terminals. Photograph the wiring, cut power at the disconnect, and confirm the correct trip temperature stamped on the switch before installing.
Compatible with Goodman GKS90703BXAD. Verify part number and temperature rating before ordering.