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The Goodman 20162903 Primary Limit Switch is a genuine OEM 150°F safety control designed for the AMH950703BXAA gas furnace and compatible Goodman/Amana models. This normally-closed thermal switch monitors heat-exchanger temperature and shuts off the burners if the furnace overheats, protecting your equipment and home from unsafe operating conditions.
The genuine OEM 20162903 is factory-calibrated to the exact 150°F trip point your furnace's safety logic depends on. Generic limit switches may have loose temperature tolerances or mismatched mounting, which can cause nuisance trips or, worse, fail to protect the heat exchanger. For a safety-critical control, OEM is strongly recommended.
Difficulty: Easy to Moderate. Replacement involves removing two mounting screws and transferring the wire terminals. Most confident DIYers can complete it in 10–15 minutes. Always disconnect power and gas before servicing, and match wiring exactly. When in doubt, use a licensed HVAC technician.