Lennox 11U72 Pressure Switch
The Lennox 11U72 Pressure Switch is a critical safety component designed for precise combustion air monitoring in high-efficiency gas furnaces. As a genuine OEM replacement part (also identified as Lennox 104371-09), this single-pole, single-throw (SPST) switch features a normally open contact configuration. It is factory-calibrated to actuate at a 0.90" WC (inches water column) set point, ensuring the draft inducer motor is generating sufficient static pressure to vent combustion gases safely before allowing the ignition sequence to proceed.
For service technicians, the 11U72 is essential for resolving furnace pressure switch open errors and short-cycling issues caused by diaphragm fatigue or contact failure. This switch is built with a high-sensitivity internal diaphragm and a robust housing to withstand the thermal demands of the burner vestibule. It is compatible with a wide range of Lennox Elite and Merit Series furnaces, including popular ML195 and 95AF units. When performing a pressure switch replacement, always verify the 0.90" vacuum rating against the specific requirements on the unit's rating plate to maintain factory-spec safety and AFUE efficiency levels.
Key Benefits for the Contractor- OEM Precision: Genuine Lennox 104371-09 construction ensures exact mounting alignment and terminal orientation for fast HVAC repairs.
- Optimized Safety: Calibrated at 0.90" WC to prevent hazardous ignition if the venting system or heat exchanger is obstructed.
- High-Rated Contacts: Features an SPST-N.O. configuration rated for 24VAC systems, providing reliable switching for the control board ignition circuit.
- Wide Compatibility: Direct drop-in for numerous Lennox gas furnace models, reducing the need for universal "make-it-fit" kits.
- Why is my Lennox furnace showing a "Pressure Switch Stuck Open" code? This is often caused by a failing 11U72 switch, a restricted flue pipe, a failing inducer motor, or moisture buildup in the pressure switch tubing.
- Can I use a universal switch instead of the 11U72? While universal switches exist, using the OEM 0.90" WC switch is highly recommended to ensure the unit operates within its engineered safety parameters.
- How do I test the Lennox 11U72? With the inducer running, use a manometer to check the actual vacuum and a multimeter to verify continuity across the terminals when the pressure exceeds 0.90" WC.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
Original: $44.99
-65%$44.99
$15.75Lennox 11U72 Pressure Switch
The Lennox 11U72 Pressure Switch is a critical safety component designed for precise combustion air monitoring in high-efficiency gas furnaces. As a genuine OEM replacement part (also identified as Lennox 104371-09), this single-pole, single-throw (SPST) switch features a normally open contact configuration. It is factory-calibrated to actuate at a 0.90" WC (inches water column) set point, ensuring the draft inducer motor is generating sufficient static pressure to vent combustion gases safely before allowing the ignition sequence to proceed.
For service technicians, the 11U72 is essential for resolving furnace pressure switch open errors and short-cycling issues caused by diaphragm fatigue or contact failure. This switch is built with a high-sensitivity internal diaphragm and a robust housing to withstand the thermal demands of the burner vestibule. It is compatible with a wide range of Lennox Elite and Merit Series furnaces, including popular ML195 and 95AF units. When performing a pressure switch replacement, always verify the 0.90" vacuum rating against the specific requirements on the unit's rating plate to maintain factory-spec safety and AFUE efficiency levels.
Key Benefits for the Contractor- OEM Precision: Genuine Lennox 104371-09 construction ensures exact mounting alignment and terminal orientation for fast HVAC repairs.
- Optimized Safety: Calibrated at 0.90" WC to prevent hazardous ignition if the venting system or heat exchanger is obstructed.
- High-Rated Contacts: Features an SPST-N.O. configuration rated for 24VAC systems, providing reliable switching for the control board ignition circuit.
- Wide Compatibility: Direct drop-in for numerous Lennox gas furnace models, reducing the need for universal "make-it-fit" kits.
- Why is my Lennox furnace showing a "Pressure Switch Stuck Open" code? This is often caused by a failing 11U72 switch, a restricted flue pipe, a failing inducer motor, or moisture buildup in the pressure switch tubing.
- Can I use a universal switch instead of the 11U72? While universal switches exist, using the OEM 0.90" WC switch is highly recommended to ensure the unit operates within its engineered safety parameters.
- How do I test the Lennox 11U72? With the inducer running, use a manometer to check the actual vacuum and a multimeter to verify continuity across the terminals when the pressure exceeds 0.90" WC.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The Lennox 11U72 Pressure Switch is a critical safety component designed for precise combustion air monitoring in high-efficiency gas furnaces. As a genuine OEM replacement part (also identified as Lennox 104371-09), this single-pole, single-throw (SPST) switch features a normally open contact configuration. It is factory-calibrated to actuate at a 0.90" WC (inches water column) set point, ensuring the draft inducer motor is generating sufficient static pressure to vent combustion gases safely before allowing the ignition sequence to proceed.
For service technicians, the 11U72 is essential for resolving furnace pressure switch open errors and short-cycling issues caused by diaphragm fatigue or contact failure. This switch is built with a high-sensitivity internal diaphragm and a robust housing to withstand the thermal demands of the burner vestibule. It is compatible with a wide range of Lennox Elite and Merit Series furnaces, including popular ML195 and 95AF units. When performing a pressure switch replacement, always verify the 0.90" vacuum rating against the specific requirements on the unit's rating plate to maintain factory-spec safety and AFUE efficiency levels.
Key Benefits for the Contractor- OEM Precision: Genuine Lennox 104371-09 construction ensures exact mounting alignment and terminal orientation for fast HVAC repairs.
- Optimized Safety: Calibrated at 0.90" WC to prevent hazardous ignition if the venting system or heat exchanger is obstructed.
- High-Rated Contacts: Features an SPST-N.O. configuration rated for 24VAC systems, providing reliable switching for the control board ignition circuit.
- Wide Compatibility: Direct drop-in for numerous Lennox gas furnace models, reducing the need for universal "make-it-fit" kits.
- Why is my Lennox furnace showing a "Pressure Switch Stuck Open" code? This is often caused by a failing 11U72 switch, a restricted flue pipe, a failing inducer motor, or moisture buildup in the pressure switch tubing.
- Can I use a universal switch instead of the 11U72? While universal switches exist, using the OEM 0.90" WC switch is highly recommended to ensure the unit operates within its engineered safety parameters.
- How do I test the Lennox 11U72? With the inducer running, use a manometer to check the actual vacuum and a multimeter to verify continuity across the terminals when the pressure exceeds 0.90" WC.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
