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The Goodman 20162904 is a genuine OEM primary high-limit temperature control for the GKS90904CXAC gas furnace and compatible Goodman/Amana models. Mounted on the heat exchanger/blower deck, this auto-reset limit switch monitors supply-air temperature and shuts off the gas valve if the furnace overheats — typically from restricted airflow, a dirty filter, or blower failure. It automatically restores the circuit once temperatures return to a safe range.
The trip temperature and probe length of a primary limit are matched precisely to your furnace's heat exchanger. A genuine Goodman control guarantees the correct cutout point, while generic substitutes risk nuisance trips or, worse, failing to protect against a real overheat. For a safety-critical control, OEM is the right call.
Moderate. Turn off power and gas, remove the blower-compartment panel, disconnect the two spade terminals, and unscrew the limit from the deck. If the new limit trips repeatedly, investigate airflow (filter, blower, ducting) before assuming a part fault.