Description
The Lennox 56M04 is a factory-specified .55″ pressure switch designed as a direct OEM replacement for compatible Lennox heating systems. Pressure switches are a critical safety component in gas furnaces and air handlers — they verify that the inducer motor is producing adequate draft before allowing the gas valve to open, helping prevent unsafe combustion conditions and protecting the heat exchanger.
Key Features
- OEM Lennox replacement pressure switch
- .55″ water column (W.C.) set point
- Monitors inducer draft to ensure safe furnace ignition sequence
- Direct drop-in replacement for compatible Lennox furnace models
- Helps protect against unsafe combustion and heat exchanger damage
- Designed for reliable, long-term performance in residential and light commercial applications
Application
This pressure switch is engineered to work within the Lennox furnace control sequence, confirming proper negative pressure from the draft inducer before the ignition cycle proceeds. Using a genuine Lennox OEM part ensures compatibility, correct set-point calibration, and maintains the integrity of your system’s safety controls.
Why Choose OEM?
- Exact fit for Lennox systems — no modifications required
- Maintains original equipment safety and performance standards
- Reduces callbacks and repeat service calls
- Backed by Lennox engineering specifications
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