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The Goodman 20162904 Primary Limit Temperature Control is a genuine OEM safety switch built for the Goodman GCH950453BXAA gas furnace. This high-limit control continuously monitors heat-exchanger temperature and shuts off the burners if the furnace overheats — protecting the equipment and your home from unsafe conditions. If your furnace ignites and then trips off, blows only cool air, or short cycles on the limit, a failed limit control is a common cause.
The genuine OEM limit control is calibrated to Goodman's exact trip and reset temperatures for this furnace. Generic switches with different set points can nuisance-trip, fail to protect the heat exchanger, or void your warranty. Because this is a safety component, we recommend OEM only.
Easy to Moderate — power off the furnace, unplug the two spade terminals, remove the mounting screws, and install the new control in the same orientation. No calibration required. A 15–30 minute job for most handy homeowners; professional service recommended if unsure.