Lennox 14A46 – 104549-04 Two-Stage Pressure Switch, High 0.81" WC, Low 0.45" WC, OEM Furnace Replacement

 

Product Description 

 

The Lennox 14A46 (104549-04) is a genuine OEM two-stage pressure switch designed for precise airflow and safety control in compatible Lennox furnace systems. This high-quality pressure switch monitors combustion airflow and ensures proper furnace operation by opening and closing at exact factory-set pressure levels. Designed to meet Lennox performance standards, it provides reliable operation, safe ignition cycling, and long-lasting durability for residential and light commercial HVAC systems.

With a high-stage set point of 0.81 inches water column and a low-stage set point of 0.45 inches water column, this replacement pressure switch restores proper furnace performance and helps prevent ignition issues, lockouts, and error codes caused by airflow irregularities. Ideal for service technicians and homeowners needing an accurate, ready-to-install OEM part.

 

Key Features

 

• Genuine Lennox OEM 2-stage pressure switch
• Set Point High: 0.81 inches WC
• Set Point Low: 0.45 inches WC
• Ensures correct furnace airflow and combustion safety
• Restores proper ignition sequence and performance
• Durable design for long-term furnace reliability
• Direct replacement for Lennox 104549-04

Compatible With

• Selected Lennox residential gas furnaces
• Units requiring dual-stage pressure control (technician should verify model compatibility)

 

Specifications

 

Set Point High: 0.81" WC
Set Point Low: 0.45" WC
Stages: Two-stage
Type: Differential pressure safety switch
Application: Furnace combustion airflow monitoring
OEM Part Number: 104549-04
Lennox Catalog Number: 14A46