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The Goodman 20162904 Primary Limit Temperature Control is a genuine OEM high-temperature safety switch for the Goodman ACVC960804CNBA gas furnace and compatible Goodman/Amana units. Mounted on the heat exchanger or burner box, the primary limit continuously monitors plenum temperature and opens the control circuit to shut down the burners if the furnace overheats — protecting the heat exchanger from cracking and preventing a fire hazard caused by restricted airflow, a dirty filter, or a failed blower.
This genuine Goodman OEM limit control is calibrated to the exact trip temperature specified for the ACVC960804CNBA. Generic limits with different cut-out/cut-in set points can cause premature shutdowns (short cycling) or, worse, fail to trip when needed. Because this is a primary safety device, matching the OEM temperature rating is critical.
OEM: factory-calibrated trip point, exact mounting footprint, full reliability. Generic: lower cost but variable calibration and fitment — not recommended for a safety limit.
Disconnect power, remove the two mounting screws and the wire connectors, and install the new limit in the same orientation. A multimeter check of continuity confirms operation. Best performed by an HVAC technician. Estimated time: 20–30 minutes.
Verify model and serial number before ordering.