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The genuine OEM Goodman 20162903 Primary Limit Switch is a 150°F over-temperature safety control for the Amana/Goodman AMV91155DXAB gas furnace. Mounted on the heat exchanger or blower deck, it opens the circuit and shuts off the burners if supply-air temperature exceeds its rating — typically caused by restricted airflow, a dirty filter, or blower failure — preventing heat-exchanger damage and unsafe operation.
The 150°F trip point is matched to this furnace's cabinet and airflow design. A generic limit switch with a different setpoint or mounting profile can cause nuisance shutdowns or fail to protect the heat exchanger. The genuine OEM 20162903 guarantees the correct temperature rating and drop-in fit.
Easy (1/5) — Two screws and two spade terminals. Cut power at the breaker before servicing. If the limit was tripping, correct the airflow issue (replace filter, check blower and ductwork) before returning the furnace to service.