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The Goodman 20162903 is a genuine OEM primary high-limit switch calibrated to open at 150°F, designed as a direct-fit replacement for the GMH950703BXAD furnace. This safety control monitors heat-exchanger temperature and interrupts the gas valve if the furnace overheats — typically caused by a dirty filter, blocked ductwork, or a failing blower — protecting the heat exchanger from thermal damage.
The OEM 20162903 is factory-calibrated to the exact 150°F trip point Goodman specified for this heat exchanger. Generic or aftermarket limits with a different set point can cause premature shutdowns (short-cycling) or, worse, fail to trip early enough to protect the furnace. Because this is a life-safety control, matching the OEM temperature rating is strongly recommended.
Easy (2/5). The switch mounts with two screws and uses spade/quick-connect terminals. Shut off power and gas before servicing, note wire positions before disconnecting, and confirm the replacement rating reads 150°F. If in doubt, use a licensed HVAC technician.