Lennox 24W49 (101021-04) is a genuine OEM two-stage pressure switch designed for precise monitoring and safe operation in Lennox residential and light-commercial HVAC systems. This factory-rated switch provides reliable airflow verification for both low and high fire operation, ensuring proper furnace performance and dependable ignition sequencing.

Engineered to maintain accurate pressure thresholds, the Lennox 24W49 pressure switch helps protect critical components, reduce nuisance lockouts, and restore unit safety when the original switch fails. It is commonly used in high-efficiency gas furnaces requiring two distinct pressure set points.

 

Key Features

• Genuine Lennox OEM replacement for 101021-04
• Two-stage pressure verification for high and low fire operation
• Set point high: 1.05" W.C.
• Set point low: 0.70" W.C.
• Ensures proper draft, combustion airflow, and safe furnace operation
• Helps prevent ignition issues, flame rollout, and pressure-related error codes
• Built for Lennox high-efficiency gas furnace models

 

Technical Specifications

• Part number: 24W49
• Alternate part number: 101021-04
• Pressure type: Two-stage (dual set point)
• High set point: 1.05 inches water column
• Low set point: 0.70 inches water column
• Application: Combustion air proving in gas furnaces
• Electrical connection: Standard two-wire terminals
• OEM compatibility: Selected Lennox furnace platforms