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The Goodman 20162904 Primary Limit Temperature Control is the genuine OEM high-limit safety switch for your VMSS961005CNAA gas furnace. This normally-closed thermal switch monitors heat-exchanger temperature and shuts off the burners if the furnace overheats — protecting against restricted airflow, blower failure, and heat-exchanger damage. A tripped or failed primary limit is a common cause of short-cycling and no-heat calls.
Limit switches are calibrated to a specific cutout temperature matched to your furnace's heat exchanger. This genuine OEM Goodman control carries the correct trip point and mounting footprint. Generic universal limits require exact temperature and length matching — for a safety device, we strongly recommend the OEM part.
Easy to Moderate — Two-wire connection and a bracket mount. Cut power at the furnace disconnect before servicing. A DIY-capable homeowner can replace it, though diagnosing a persistent limit trip should involve a technician to rule out airflow issues.
Compatible with Goodman VMSS961005CNAA. Questions? Email info@nationalhvacparts.com.