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The Goodman 20162903 Primary Limit Switch is the genuine OEM high-limit safety control for the ACVC90704CXAA 96% AFUE two-stage variable-speed gas furnace. This snap-disc limit switch monitors heat-exchanger temperature and shuts off the gas valve if the furnace overheats — a critical safety function. When a furnace short-cycles, locks out, or stops heating, a failed primary limit is a common cause.
Our OEM Goodman limit switch matches the factory open/close temperature setpoint exactly, ensuring the furnace's safety logic behaves as engineered. Lower-cost generic equivalents fit physically and cost less, but tolerances on the trip temperature can vary. For a safety-critical control like a limit switch, the OEM part is recommended.
Easy (1/5). Two-wire spade-terminal connection and two mounting screws. Always shut off power and gas before servicing. Typically a 10–15 minute repair for a homeowner comfortable around the furnace; if unsure, consult a licensed HVAC technician.