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The Goodman 20162904 is a genuine OEM primary limit temperature control (high-limit safety switch) engineered for the Goodman GCH950453BXAC gas furnace and compatible models. Mounted on the heat exchanger or blower deck, this safety control continuously monitors supply-air temperature and interrupts the burner circuit if the furnace overheats — protecting the heat exchanger from cracking and preventing unsafe operation. A failed or nuisance-tripping limit is one of the most common causes of a furnace that lights briefly and then shuts down on high limit.
OEM (recommended): Exact factory trip temperature, mounting, and terminal layout — guaranteed drop-in fit and correct safety calibration. Generic: A lower-cost universal limit that may require verifying the trip point and adapting terminals; acceptable for budget repairs but not calibration-matched to the original.
Easy — 2 of 5. Typically two mounting screws and two spade connectors. Cut power at the disconnect, photograph the wiring, swap the control, and restore power. Most handy homeowners finish in 15–20 minutes; when in doubt, use a licensed HVAC technician.