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The Goodman 20162904 Primary Limit Temperature Control is the main high-limit safety device on the GME951005DXAB gas furnace and compatible GME95 series units. Mounted on the heat-exchanger bulkhead, it continuously monitors supply-air temperature and shuts off the gas burners if the furnace overheats — the primary defense against a cracked heat exchanger caused by restricted airflow. This auto-reset control re-closes once temperatures return to a safe range, restoring normal operation automatically.
The primary limit is a critical safety component, and its trip point is matched to the GME951005DX airflow and heat-exchanger design. The genuine Goodman 20162904 uses the factory calibration and mounting bracket, ensuring correct protection and a bolt-in fit. Substituting a generic control with a different setpoint can cause nuisance shutdowns or, worse, allow unsafe operation.
Moderate (3/5). Shut off gas and power, remove the burner-compartment panel, disconnect the two leads, and unbolt the control from the heat-exchanger plate. Reinstall in the same orientation and verify airflow before returning the unit to service.