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The genuine Goodman 20162903 primary limit switch is a 150°F-rated OEM high-limit safety control for the GCH950904CXAC gas furnace and related Goodman/Amana 95% AFUE units. Mounted on the heat-exchanger bulkhead, this primary limit continuously monitors supply-air temperature and opens the burner control circuit if the furnace overheats — the front-line protection against a failed blower, dirty filter, or restricted airflow.
The 150°F trip point on this Goodman OEM switch is matched to your furnace's heat-exchanger design. A generic limit with a different rating can trip early (short cycling and no heat) or too late (allowing an unsafe overheat). Because this is a primary safety device, the OEM part is strongly recommended.
Difficulty: Easy to Moderate. Disconnect furnace power, photograph the wiring, remove the two mounting screws, transfer the leads to the new limit, and reinstall on the same bracket. Allow 20–30 minutes. If the new limit trips, check filter and blower — repeated trips point to an airflow problem, not the switch.