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The Goodman 20162901 Primary Limit Switch is the factory high-limit safety control for the ADSS801005CXAC gas furnace. Mounted on the heat exchanger or blower compartment, it senses supply-air temperature and opens the burner circuit if the furnace overheats due to a dirty filter, blocked ductwork, or failed blower. A tripped or failed limit switch is a common cause of short-cycling and no-heat calls.
The OEM 20162901 is calibrated to the exact trip and reset temperatures specified for your furnace. Generic snap-discs with the wrong setpoint can either nuisance-trip or fail to protect the heat exchanger. As a life-safety limit control, the OEM part is strongly recommended.
Easy to Moderate. Two mounting screws and two spade terminals. Cut power at the disconnect, note wire positions, and confirm the sensing element seats in the same location as the original. Verify normal cycling after installation.