IMAGE COMING SOON
OEM Guaranteed
Same-Day Ship
30-Day Returns
Secure Checkout
The Goodman 20162903 Primary Limit Switch is a genuine OEM high-limit safety control rated at 150°F for the GKS90704CXAC gas furnace and compatible Goodman/Amana models. Mounted on the heat exchanger or blower deck, this thermal cutout opens the control circuit if the furnace overheats — typically from restricted airflow, a dirty filter, or a failed blower — shutting down the burners to prevent heat-exchanger damage and fire hazards. A failed limit switch causes short cycling, no-heat conditions, or a furnace that locks out on safety.
Trip temperature and mounting bracket are model-specific. The genuine OEM 20162903 is calibrated to the exact 150°F set point your furnace requires; a generic switch with a different rating or bracket can nuisance-trip, fail to protect the heat exchanger, or not fit the opening. For a safety component, always use the factory part.
Easy–Moderate (2.5/5). Two mounting screws and two spade terminals. Shut off power, note wire positions, swap the switch, and verify normal cycling. Because this is a safety device, confirm proper operation after install or consult a licensed HVAC technician.