Lennox 33W86 Limit Switch
The Lennox 33W86 Limit Switch is a critical safety component designed for precise thermal regulation within residential and commercial HVAC systems. This SPST (Single Pole Single Throw) control is engineered to monitor heat exchanger temperatures, effectively interrupting the electrical circuit if internal conditions exceed safe operating parameters. Calibrated with a 175F-close rating, this switch automatically resets once the temperature drops, ensuring the blower or fan circuit re-engages to maintain optimal airflow. As an authentic OEM Lennox replacement part (cross-referenced with Lennox 100847-07), it features a durable die-cast aluminum housing and stainless steel plunger to withstand high-heat industrial environments.
For technicians servicing Lennox LGH048S4 or KGA048S4 units, the 33W86 provides a direct-fit solution with quick-connect terminals for streamlined field installation. This high-limit switch is essential for preventing furnace overheating caused by restricted airflow, clogged filters, or blower motor failure. Replacing a faulty or "open" limit switch with this genuine component restores the unit's safety sequence, protecting the heat exchanger from structural damage and ensuring compliance with manufacturer specifications.
Key Benefits
- Direct OEM Compatibility: Verified fit for multiple Lennox furnace and air handler models, replacing part number 100847-07.
- Precision Thermal Control: Factory-calibrated 175 degree Fahrenheit close point for reliable system re-activation during cool-down cycles.
- Industrial-Grade Build: Constructed with die-cast aluminum and stainless steel components for enhanced mechanical reliability in NEMA 1 environments.
- Safety Compliance: Meets UL, CSA, and IEC standards, functioning as a primary over-temperature protector for gas and electric heating units.
- Simplified Installation: Features standard surface-mount brackets and universal electrical connections for rapid on-site replacement.
Common Questions
What causes a Lennox limit switch to trip frequently?
Frequent tripping is usually caused by restricted airflow. Check for a dirty air filter, blocked return air vents, or a failing blower motor that cannot move enough air across the heat exchanger.
Can I use a 33W86 to replace a manual reset limit switch?
The 33W86 is an automatic reset SPST 175F-close switch. It should only be used if the original specifications of your unit call for an automatic reset at this specific temperature. Always verify the part number in the service manual.
How do I test if my 33W86 limit switch is faulty?
Using a multimeter, check for continuity across the terminals. If the switch is cool (below 175°F) and shows an open circuit when it should be closed, the internal contacts have likely failed and the part needs replacement.
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: $16.10
-65%$16.10
$5.63Lennox 33W86 Limit Switch
The Lennox 33W86 Limit Switch is a critical safety component designed for precise thermal regulation within residential and commercial HVAC systems. This SPST (Single Pole Single Throw) control is engineered to monitor heat exchanger temperatures, effectively interrupting the electrical circuit if internal conditions exceed safe operating parameters. Calibrated with a 175F-close rating, this switch automatically resets once the temperature drops, ensuring the blower or fan circuit re-engages to maintain optimal airflow. As an authentic OEM Lennox replacement part (cross-referenced with Lennox 100847-07), it features a durable die-cast aluminum housing and stainless steel plunger to withstand high-heat industrial environments.
For technicians servicing Lennox LGH048S4 or KGA048S4 units, the 33W86 provides a direct-fit solution with quick-connect terminals for streamlined field installation. This high-limit switch is essential for preventing furnace overheating caused by restricted airflow, clogged filters, or blower motor failure. Replacing a faulty or "open" limit switch with this genuine component restores the unit's safety sequence, protecting the heat exchanger from structural damage and ensuring compliance with manufacturer specifications.
Key Benefits
- Direct OEM Compatibility: Verified fit for multiple Lennox furnace and air handler models, replacing part number 100847-07.
- Precision Thermal Control: Factory-calibrated 175 degree Fahrenheit close point for reliable system re-activation during cool-down cycles.
- Industrial-Grade Build: Constructed with die-cast aluminum and stainless steel components for enhanced mechanical reliability in NEMA 1 environments.
- Safety Compliance: Meets UL, CSA, and IEC standards, functioning as a primary over-temperature protector for gas and electric heating units.
- Simplified Installation: Features standard surface-mount brackets and universal electrical connections for rapid on-site replacement.
Common Questions
What causes a Lennox limit switch to trip frequently?
Frequent tripping is usually caused by restricted airflow. Check for a dirty air filter, blocked return air vents, or a failing blower motor that cannot move enough air across the heat exchanger.
Can I use a 33W86 to replace a manual reset limit switch?
The 33W86 is an automatic reset SPST 175F-close switch. It should only be used if the original specifications of your unit call for an automatic reset at this specific temperature. Always verify the part number in the service manual.
How do I test if my 33W86 limit switch is faulty?
Using a multimeter, check for continuity across the terminals. If the switch is cool (below 175°F) and shows an open circuit when it should be closed, the internal contacts have likely failed and the part needs replacement.
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 33W86 Limit Switch is a critical safety component designed for precise thermal regulation within residential and commercial HVAC systems. This SPST (Single Pole Single Throw) control is engineered to monitor heat exchanger temperatures, effectively interrupting the electrical circuit if internal conditions exceed safe operating parameters. Calibrated with a 175F-close rating, this switch automatically resets once the temperature drops, ensuring the blower or fan circuit re-engages to maintain optimal airflow. As an authentic OEM Lennox replacement part (cross-referenced with Lennox 100847-07), it features a durable die-cast aluminum housing and stainless steel plunger to withstand high-heat industrial environments.
For technicians servicing Lennox LGH048S4 or KGA048S4 units, the 33W86 provides a direct-fit solution with quick-connect terminals for streamlined field installation. This high-limit switch is essential for preventing furnace overheating caused by restricted airflow, clogged filters, or blower motor failure. Replacing a faulty or "open" limit switch with this genuine component restores the unit's safety sequence, protecting the heat exchanger from structural damage and ensuring compliance with manufacturer specifications.
Key Benefits
- Direct OEM Compatibility: Verified fit for multiple Lennox furnace and air handler models, replacing part number 100847-07.
- Precision Thermal Control: Factory-calibrated 175 degree Fahrenheit close point for reliable system re-activation during cool-down cycles.
- Industrial-Grade Build: Constructed with die-cast aluminum and stainless steel components for enhanced mechanical reliability in NEMA 1 environments.
- Safety Compliance: Meets UL, CSA, and IEC standards, functioning as a primary over-temperature protector for gas and electric heating units.
- Simplified Installation: Features standard surface-mount brackets and universal electrical connections for rapid on-site replacement.
Common Questions
What causes a Lennox limit switch to trip frequently?
Frequent tripping is usually caused by restricted airflow. Check for a dirty air filter, blocked return air vents, or a failing blower motor that cannot move enough air across the heat exchanger.
Can I use a 33W86 to replace a manual reset limit switch?
The 33W86 is an automatic reset SPST 175F-close switch. It should only be used if the original specifications of your unit call for an automatic reset at this specific temperature. Always verify the part number in the service manual.
How do I test if my 33W86 limit switch is faulty?
Using a multimeter, check for continuity across the terminals. If the switch is cool (below 175°F) and shows an open circuit when it should be closed, the internal contacts have likely failed and the part needs replacement.
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.
