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The Goodman 20162904 Primary Limit Temperature Control is a genuine OEM high-limit safety switch built for the WGFM28115V5CXAB 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 against cracked heat exchangers, blocked airflow, and fire hazards. A failed limit control is a common cause of furnaces that short-cycle, refuse to fire, or trip on overheat.
This factory-original control is calibrated to the exact trip and reset temperatures specified for your furnace. Generic limit switches with different setpoints can nuisance-trip or, worse, fail to protect the heat exchanger. OEM ensures correct safety response and keeps your warranty intact.
Moderate — mounted to the burner box or heat-exchanger panel with two screws and spade terminals. Basic hand tools and a photo of the wiring are recommended. Always disconnect power before servicing. If unsure, consult a licensed HVAC technician.