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The Lennox 47K16 is an OEM-grade pressure switch engineered specifically for Lennox HVAC systems to continuously monitor operating pressure and protect system components. This switch acts as a safety device, cutting power to the system when abnormal high or low pressure conditions are detected, helping to prevent costly compressor and refrigerant circuit damage. If your Lennox unit experiences nuisance shutdowns, failure to cool, or pressure fault alerts, replacing the 47K16 switch may restore normal operation.