Description
The Lennox 73W35 is an OEM-grade two-stage pressure switch engineered for use in Lennox gas furnace systems. Pressure switches are a critical safety component in modern forced-air furnaces — they verify that the draft inducer motor has established proper airflow before allowing the gas valve to open, protecting against hazardous flue gas conditions and ensuring efficient, code-compliant operation.
As a two-stage switch, the 73W35 is designed to work in conjunction with two-stage furnace systems, monitoring pressure at both low-fire and high-fire stages of operation. This dual-stage monitoring capability helps maximize system efficiency and safety across the full range of heating output.
Key Features
- OEM Lennox replacement pressure switch — direct drop-in fit for compatible Lennox furnace models
- Two-stage design monitors inducer pressure at both low-fire and high-fire operation
- Prevents gas valve activation if adequate draft pressure is not confirmed
- Protects against flue gas backdrafting and incomplete combustion
- Helps maintain system efficiency and extends equipment lifespan
- Reliable diaphragm-actuated switching mechanism for consistent performance
Application
- Designed for use in Lennox two-stage gas furnace systems
- Replaces failed or suspect pressure switches during routine service or troubleshooting
- Compatible with Lennox models specifying OEM part number 73W35
Why Replace Your Pressure Switch?
A faulty pressure switch is one of the most common causes of furnace no-heat calls. Symptoms include the furnace failing to ignite, short-cycling, or displaying a pressure switch fault code. Using a genuine Lennox OEM replacement like the 73W35 ensures proper calibration and a reliable fit — eliminating the guesswork associated with aftermarket alternatives.
Always verify compatibility with your specific furnace model number before installation. Consult the equipment service manual for proper wiring and mounting procedures.
Reviews
There are no reviews yet.