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The genuine Goodman 20162904 Primary Limit Temperature Control is the high-limit safety switch for the Amana/Goodman AMH950904CXAA gas furnace. Mounted on the heat exchanger/burner bulkhead, it monitors supply-air temperature and shuts off the burners if the furnace overheats — protecting the heat exchanger from cracking and preventing a fire hazard. If your furnace short-cycles on the limit, overheats, or won't fire, a failed primary limit is a common cause.
The OEM 20162904 is calibrated to the exact trip and reset temperatures Goodman engineered for this furnace's airflow and heat exchanger. Universal or substitute limits with the wrong setpoint or flange can trip prematurely, fail to protect the unit, or not seat correctly. Because this is a life-safety control, we recommend genuine OEM only.
Easy–Moderate (2/5) — Cut power at the disconnect, remove the two mounting screws, unplug the wire harness, and swap in the new limit. Confirm correct orientation against the heat exchanger. Best performed by a licensed HVAC technician; verify normal cycling afterward.