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The Goodman 20162901 Primary Limit Switch is a genuine OEM high-limit safety control for the VCES960403BNAA gas furnace and compatible models. Mounted on the heat exchanger or blower deck, this thermostatic switch monitors supply-air temperature and opens the burner circuit if the furnace overheats — protecting the heat exchanger from cracking and preventing unsafe operation. A failed or drifted limit switch is a leading cause of short-cycling, no-heat calls, and nuisance lockouts.
The trip and reset temperatures on a limit switch are safety-critical and model-specific. A generic switch with a different cut-out point may either trip prematurely (constant shutdowns) or fail to trip when it should, defeating the furnace's overheat protection. This genuine Goodman OEM limit switch is calibrated to the factory setpoint for the VCES960403BNAA, so the furnace's safety logic behaves exactly as designed.
Easy–Moderate (2/5). The switch is secured by two screws with quick-connect terminals. Cut power at the furnace disconnect, note wire positions, and confirm orientation matches the original. Test for proper heating cycle afterward. Recommended for a technician if you cannot verify airflow-related overheat causes first.
Guaranteed to fit the VCES960403BNAA — restore safe, reliable heating.