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The Goodman 20162904 Primary Limit Temperature Control is a genuine OEM high-limit safety switch for the Amana/Goodman AMEH960403BXAA gas furnace. Mounted on the heat exchanger bulkhead, it senses supply-air temperature and shuts off the burners if the furnace overheats due to restricted airflow, protecting the heat exchanger and preventing a hazardous condition.
The OEM 20162904 is calibrated to the exact trip temperature engineered for this furnace. Because a primary limit is a life-safety device, generic substitutes with different set points can cause nuisance lockouts or, worse, fail to protect the heat exchanger. We recommend genuine OEM for all limit controls.
Moderate (2 of 5). Requires removing the blower-door panel, two mounting screws, and transferring the wiring. Shut off gas and electrical power first. If the limit trips after replacement, diagnose airflow (dirty filter, blocked coil, or blower issues) rather than repeatedly resetting.