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The Goodman 20162903 Primary Limit Switch is a genuine OEM high-limit safety control engineered for the Goodman GMH950703BXAA 96% AFUE two-stage gas furnace and compatible GMH95/GCH95 series units. This normally-closed thermal switch monitors heat-exchanger and plenum temperature, opening the burner circuit if the furnace overheats to protect your equipment and home.
This is a factory-original Goodman part calibrated to the exact trip point your control board expects. Aftermarket limit switches may carry a slightly lower price, but a mismatched calibration can cause nuisance lockouts or fail to protect the heat exchanger. For a safety-critical control, we recommend the genuine OEM switch.
Difficulty: Easy (DIY-friendly). Replacement is a simple two-wire swap on the burner box or heat-exchanger bracket. Always shut off power and gas at the furnace before servicing. Most homeowners complete this repair in under 20 minutes with a nut driver. If your furnace is repeatedly tripping on limit, also check airflow, the filter, and the blower before replacing the switch.
Backed by genuine Goodman quality. If you are unsure of fitment for your model, contact us at info@nationalhvacparts.com before ordering.