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The Goodman 20162904 Primary Limit Temperature Control is the genuine OEM high-limit switch for the AMH80604BXBC 80% AFUE gas furnace. Mounted on the heat exchanger bulkhead, it continuously senses supply-air temperature and opens the burner circuit if the furnace overheats — typically caused by a dirty filter, blocked ductwork, or a failed blower. It closes automatically once temperatures return to normal.
This is a critical overheat-protection component. A faulty or out-of-spec primary limit is a common cause of short-cycling and no-heat calls, so replacing it with the correctly calibrated OEM part restores reliable, safe operation.
The 20162904 is factory-set to this furnace's specific cutout and cut-in temperatures and matches the OEM bracket geometry for correct sensor placement. Generic limits with different trip points or brackets can misread air temperature, causing nuisance trips or inadequate protection. OEM is recommended for this safety device.
Easy (1/5). Disconnect power, unplug the two spade wires, remove the mounting screws, and install the replacement in the same orientation. About 15 minutes for most DIYers.