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The Goodman 20162904 Primary Limit Temperature Control is a genuine OEM high-limit safety switch built for the AMVC80803BNCA gas furnace. Mounted on the heat exchanger/blower housing, this normally-closed thermal switch monitors supply-air temperature and shuts off the gas valve if the furnace overheats — protecting the heat exchanger and preventing dangerous operating conditions.
The OEM limit is factory-calibrated to the exact trip temperature specified for this furnace model. Because this is a life-safety component, a generic switch with a different set point can cause nuisance shutdowns or, worse, fail to trip during a genuine overheat. OEM is the recommended choice for any high-limit control.
Easy to Moderate — Typically two mounting screws and two spade terminals. Turn off power at the disconnect before servicing. Confirm the replacement matches the original set point and orientation. Professional installation recommended for gas appliances.