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The Goodman 20162904 Primary Limit Temperature Control is the genuine OEM high-limit safety switch for the VMES800604BXAA gas furnace. Mounted on the heat exchanger, it continuously monitors supply-air temperature and cuts power to the gas valve if the furnace overheats — protecting the heat exchanger and blower from damage caused by restricted airflow, a dirty filter, or blower failure.
The primary limit is factory-matched to this furnace's specific trip temperature and probe length. Because it is a primary safety and comfort control, an OEM part guarantees the furnace cycles on the correct temperature band. Generic replacements with the wrong setpoint can cause short-cycling, no-heat lockouts, or unsafe over-temperature operation.
Moderate (2/5). Power down, disconnect the wiring terminals, remove the mounting screws, and seat the new control with the sensing element in the correct airstream position. Confirm normal heat cycling after restart.