Lennox 11W51 Limit Switch
The Lennox 11W51 Limit Switch is a critical safety component designed for precise thermal regulation within high-efficiency residential heating systems. Operating with a 160-190F temperature range, this auto reset limit switch is normally closed and engineered to open the circuit at 190°F to prevent heat exchanger damage and potentially hazardous conditions. Once the plenum temperature cools back to 160°F, the 11W51 automatically resets, allowing the system to resume normal ignition cycles. This genuine HVAC replacement part is essential for technicians diagnosing furnace short-cycling or "limit open" error codes on control boards.
Built for long-term reliability in demanding environments, this Lennox furnace limit switch serves as a direct replacement for Lennox part number 11W51 and various cross-referenced models from Armstrong, Ducane, and Allied Air. Its quick-reacting bimetal disc ensures accurate sensing, making it a staple for maintaining the OEM specifications of 13GEP and ELO series equipment. For contractors, installing this automatic reset switch ensures the system remains within factory-defined safety parameters while minimizing nuisance trips caused by minor airflow fluctuations.
- Precise Safety Cut-Out: Opens at 190°F to protect internal components from excessive thermal stress.
- Automatic Reset Logic: Closes at 160°F, eliminating the need for manual intervention after a temporary over-temperature event.
- OEM Compatibility: Guaranteed fit for specific Lennox, Armstrong, and Ducane residential units to maintain system integrity.
- Durable Bimetal Construction: Designed to withstand thousands of cycles without drifting from calibrated setpoints.
Common Questions
What are the symptoms of a failing 11W51 limit switch?
Usually, a faulty switch will cause the furnace blower to run continuously while the burners fail to ignite, or it may trip prematurely, leading to frequent short-cycling. Technicians should check for continuity across the terminals when the system is cool.
Can I use a manual reset switch to replace the 11W51?
No. This is an automatic reset component. Replacing it with a manual reset switch or a component with a different temperature rating may bypass critical safety sequences or cause unnecessary system lockouts.
What causes this limit switch to trip frequently?
While the switch itself can fail, frequent tripping often indicates restricted airflow. Check for a clogged air filter, blocked return air grilles, a failing blower motor, or a dirty evaporator coil before replacing the switch.
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: $11.04
-65%$11.04
$3.86Lennox 11W51 Limit Switch
The Lennox 11W51 Limit Switch is a critical safety component designed for precise thermal regulation within high-efficiency residential heating systems. Operating with a 160-190F temperature range, this auto reset limit switch is normally closed and engineered to open the circuit at 190°F to prevent heat exchanger damage and potentially hazardous conditions. Once the plenum temperature cools back to 160°F, the 11W51 automatically resets, allowing the system to resume normal ignition cycles. This genuine HVAC replacement part is essential for technicians diagnosing furnace short-cycling or "limit open" error codes on control boards.
Built for long-term reliability in demanding environments, this Lennox furnace limit switch serves as a direct replacement for Lennox part number 11W51 and various cross-referenced models from Armstrong, Ducane, and Allied Air. Its quick-reacting bimetal disc ensures accurate sensing, making it a staple for maintaining the OEM specifications of 13GEP and ELO series equipment. For contractors, installing this automatic reset switch ensures the system remains within factory-defined safety parameters while minimizing nuisance trips caused by minor airflow fluctuations.
- Precise Safety Cut-Out: Opens at 190°F to protect internal components from excessive thermal stress.
- Automatic Reset Logic: Closes at 160°F, eliminating the need for manual intervention after a temporary over-temperature event.
- OEM Compatibility: Guaranteed fit for specific Lennox, Armstrong, and Ducane residential units to maintain system integrity.
- Durable Bimetal Construction: Designed to withstand thousands of cycles without drifting from calibrated setpoints.
Common Questions
What are the symptoms of a failing 11W51 limit switch?
Usually, a faulty switch will cause the furnace blower to run continuously while the burners fail to ignite, or it may trip prematurely, leading to frequent short-cycling. Technicians should check for continuity across the terminals when the system is cool.
Can I use a manual reset switch to replace the 11W51?
No. This is an automatic reset component. Replacing it with a manual reset switch or a component with a different temperature rating may bypass critical safety sequences or cause unnecessary system lockouts.
What causes this limit switch to trip frequently?
While the switch itself can fail, frequent tripping often indicates restricted airflow. Check for a clogged air filter, blocked return air grilles, a failing blower motor, or a dirty evaporator coil before replacing the switch.
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.
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Description
The Lennox 11W51 Limit Switch is a critical safety component designed for precise thermal regulation within high-efficiency residential heating systems. Operating with a 160-190F temperature range, this auto reset limit switch is normally closed and engineered to open the circuit at 190°F to prevent heat exchanger damage and potentially hazardous conditions. Once the plenum temperature cools back to 160°F, the 11W51 automatically resets, allowing the system to resume normal ignition cycles. This genuine HVAC replacement part is essential for technicians diagnosing furnace short-cycling or "limit open" error codes on control boards.
Built for long-term reliability in demanding environments, this Lennox furnace limit switch serves as a direct replacement for Lennox part number 11W51 and various cross-referenced models from Armstrong, Ducane, and Allied Air. Its quick-reacting bimetal disc ensures accurate sensing, making it a staple for maintaining the OEM specifications of 13GEP and ELO series equipment. For contractors, installing this automatic reset switch ensures the system remains within factory-defined safety parameters while minimizing nuisance trips caused by minor airflow fluctuations.
- Precise Safety Cut-Out: Opens at 190°F to protect internal components from excessive thermal stress.
- Automatic Reset Logic: Closes at 160°F, eliminating the need for manual intervention after a temporary over-temperature event.
- OEM Compatibility: Guaranteed fit for specific Lennox, Armstrong, and Ducane residential units to maintain system integrity.
- Durable Bimetal Construction: Designed to withstand thousands of cycles without drifting from calibrated setpoints.
Common Questions
What are the symptoms of a failing 11W51 limit switch?
Usually, a faulty switch will cause the furnace blower to run continuously while the burners fail to ignite, or it may trip prematurely, leading to frequent short-cycling. Technicians should check for continuity across the terminals when the system is cool.
Can I use a manual reset switch to replace the 11W51?
No. This is an automatic reset component. Replacing it with a manual reset switch or a component with a different temperature rating may bypass critical safety sequences or cause unnecessary system lockouts.
What causes this limit switch to trip frequently?
While the switch itself can fail, frequent tripping often indicates restricted airflow. Check for a clogged air filter, blocked return air grilles, a failing blower motor, or a dirty evaporator coil before replacing the switch.
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.
