Lennox 10M79 Limit Switch
The Lennox 10M79 Limit Switch is a critical safety component engineered for precision thermal monitoring in HVAC systems and residential furnaces. This OEM Lennox part, also identified by manufacturer number 10M7901, features an L140-40F configuration. It is calibrated to open the electrical circuit when internal temperatures reach a 140°F limit, effectively preventing heat exchanger damage and ensuring safe appliance operation. The switch automatically resets (recycles) once the temperature drops to 100°F (a 40°F differential), allowing the system to resume normal heating cycles without manual intervention.
Designed for high-reliability applications, this furnace limit control uses a tan label identifier and a robust housing to withstand the high-temperature environment of a gas furnace or air handler. Contractors typically use the Lennox 10M79 as a direct replacement limit switch to resolve frequent system cycling or "lockout" codes caused by failing thermal sensors. Its compact form factor (approximately 3.8" x 2" x 1.9") and standard mounting footprint ensure a seamless fit into existing Lennox heating equipment, providing accurate temperature regulation and fast response times to thermal variations.
Key Benefits
- Precision Thermal Calibration: Fixed 140°F trip point with a 40°F reset differential ensures consistent overheat protection for the heat exchanger.
- Direct OEM Compatibility: Engineered specifically for Lennox HVAC units, providing 1:1 fitment and electrical performance matching factory specifications.
- Rugged Construction: Built with high-grade components to resist the moisture and extreme heat typical of industrial heating processes.
- System Safety Enhancement: Rapidly interrupts the 24V or 120V circuit to the gas valve or inducer when safe operating temperatures are exceeded.
Common Questions
- Will this switch fix my furnace blower running constantly? A tripped or faulty limit switch is a common culprit for a blower motor that won't shut off, as the system remains in a "cool down" safety mode.
- What does L140-40F stand for technically? The "L" indicates a limit control, "140" is the opening temperature in Fahrenheit, and "40" represents the temperature drop required for the switch to reset.
- Is the Lennox 10M79 compatible with other brands? While designed for Lennox, this universal-style limit switch may fit other brands like Armstrong or Ducane if the temperature ratings and mounting depth align with the original part.
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: $19.00
-65%$19.00
$6.65Lennox 10M79 Limit Switch
The Lennox 10M79 Limit Switch is a critical safety component engineered for precision thermal monitoring in HVAC systems and residential furnaces. This OEM Lennox part, also identified by manufacturer number 10M7901, features an L140-40F configuration. It is calibrated to open the electrical circuit when internal temperatures reach a 140°F limit, effectively preventing heat exchanger damage and ensuring safe appliance operation. The switch automatically resets (recycles) once the temperature drops to 100°F (a 40°F differential), allowing the system to resume normal heating cycles without manual intervention.
Designed for high-reliability applications, this furnace limit control uses a tan label identifier and a robust housing to withstand the high-temperature environment of a gas furnace or air handler. Contractors typically use the Lennox 10M79 as a direct replacement limit switch to resolve frequent system cycling or "lockout" codes caused by failing thermal sensors. Its compact form factor (approximately 3.8" x 2" x 1.9") and standard mounting footprint ensure a seamless fit into existing Lennox heating equipment, providing accurate temperature regulation and fast response times to thermal variations.
Key Benefits
- Precision Thermal Calibration: Fixed 140°F trip point with a 40°F reset differential ensures consistent overheat protection for the heat exchanger.
- Direct OEM Compatibility: Engineered specifically for Lennox HVAC units, providing 1:1 fitment and electrical performance matching factory specifications.
- Rugged Construction: Built with high-grade components to resist the moisture and extreme heat typical of industrial heating processes.
- System Safety Enhancement: Rapidly interrupts the 24V or 120V circuit to the gas valve or inducer when safe operating temperatures are exceeded.
Common Questions
- Will this switch fix my furnace blower running constantly? A tripped or faulty limit switch is a common culprit for a blower motor that won't shut off, as the system remains in a "cool down" safety mode.
- What does L140-40F stand for technically? The "L" indicates a limit control, "140" is the opening temperature in Fahrenheit, and "40" represents the temperature drop required for the switch to reset.
- Is the Lennox 10M79 compatible with other brands? While designed for Lennox, this universal-style limit switch may fit other brands like Armstrong or Ducane if the temperature ratings and mounting depth align with the original part.
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.
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Description
The Lennox 10M79 Limit Switch is a critical safety component engineered for precision thermal monitoring in HVAC systems and residential furnaces. This OEM Lennox part, also identified by manufacturer number 10M7901, features an L140-40F configuration. It is calibrated to open the electrical circuit when internal temperatures reach a 140°F limit, effectively preventing heat exchanger damage and ensuring safe appliance operation. The switch automatically resets (recycles) once the temperature drops to 100°F (a 40°F differential), allowing the system to resume normal heating cycles without manual intervention.
Designed for high-reliability applications, this furnace limit control uses a tan label identifier and a robust housing to withstand the high-temperature environment of a gas furnace or air handler. Contractors typically use the Lennox 10M79 as a direct replacement limit switch to resolve frequent system cycling or "lockout" codes caused by failing thermal sensors. Its compact form factor (approximately 3.8" x 2" x 1.9") and standard mounting footprint ensure a seamless fit into existing Lennox heating equipment, providing accurate temperature regulation and fast response times to thermal variations.
Key Benefits
- Precision Thermal Calibration: Fixed 140°F trip point with a 40°F reset differential ensures consistent overheat protection for the heat exchanger.
- Direct OEM Compatibility: Engineered specifically for Lennox HVAC units, providing 1:1 fitment and electrical performance matching factory specifications.
- Rugged Construction: Built with high-grade components to resist the moisture and extreme heat typical of industrial heating processes.
- System Safety Enhancement: Rapidly interrupts the 24V or 120V circuit to the gas valve or inducer when safe operating temperatures are exceeded.
Common Questions
- Will this switch fix my furnace blower running constantly? A tripped or faulty limit switch is a common culprit for a blower motor that won't shut off, as the system remains in a "cool down" safety mode.
- What does L140-40F stand for technically? The "L" indicates a limit control, "140" is the opening temperature in Fahrenheit, and "40" represents the temperature drop required for the switch to reset.
- Is the Lennox 10M79 compatible with other brands? While designed for Lennox, this universal-style limit switch may fit other brands like Armstrong or Ducane if the temperature ratings and mounting depth align with the original part.
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.
