Lennox 11U65 – 104371-02 Pressure Switch, 0.60" W.C. Actuation

 

The Lennox 11U65 (104371-02) Pressure Switch is an OEM-grade safety control designed to monitor proper draft and airflow conditions inside compatible Lennox heating systems. This negative pressure switch ensures the furnace operates safely by closing or opening the electrical circuit based on measured vacuum levels. With a precise actuation point of 0.60 inches water column, it provides dependable performance, accurate airflow monitoring, and long-lasting reliability in residential and light-commercial gas furnaces.

Ideal for technicians performing heating system repairs, draft troubleshooting, or preventative maintenance, this Lennox 0.60" W.C. pressure switch is engineered for fast replacement, proper fit, and consistent operation under a wide range of furnace conditions.

 

Key Features

 

• Genuine Lennox OEM pressure switch
• Actuation point: 0.60" W.C. for accurate draft verification
• Ensures safe furnace startup and combustion airflow
• Compatible with multiple Lennox gas furnace models
• Durable construction for stable operation in varying temperatures
• Simple two-port design for easy installation and tubing connection
• Prevents furnace short-cycling and pressure-related fault codes

 

Technical Specifications

 

• Manufacturer: Lennox
• Part Number: 11U65
• Catalog Number: 104371-02
• Pressure Setting: Actuates at 0.60" W.C.
• Switch Type: Negative pressure (vacuum) draft-inducer monitoring
• Electrical Rating: Low-voltage control circuit
• Ports: Single or dual (varies by batch; OEM match ensured)
• Application: Furnace airflow and draft safety control
• Operating Temperature: Standard HVAC furnace range
• Mounting: OEM bracket alignment for Lennox housings