Lennox 56W24 Limit Switch

For HVAC technicians managing furnace cycle safety, the Lennox 56W24 Limit Switch is the OEM replacement part required to maintain high-limit temperature protection. This auto reset limit switch is engineered with a setpoint range of 180°F to 210°F, effectively monitoring heat exchanger temperatures to prevent thermal overloads and equipment damage. Featuring a 4-inch insulation sleeve and single-pole, double-throw (SPDT) contact configuration, it ensures precise electrical response during critical heating cycles. As the direct furnace high limit switch successor for legacy part numbers 46105-009 and 56W2401, it offers a drop-in HVAC part compatibility for a wide range of Lennox, Allied, and Armstrong residential heating units. The gold sleeve design and brass terminals provide superior conductivity and resistance to the harsh environment inside a burner compartment, ensuring the automatic reset function performs reliably to protect the primary heat exchanger from overheating during airflow restrictions.

Key Benefits for Contractors

• Precise Thermal Protection: Specifically calibrated for an 180-210°F temperature range to ensure system shut-off before heat stress occurs.
• Universal Replacement: Direct cross-reference for Lennox 46105-009, 56W2401, and R46105-009.
• Enhanced Insulation: Includes a 4" insulation sleeve to protect the sensor from false readings and ambient heat interference.
• High Conductivity: Features brass terminals for a stable electrical connection in high-vibration furnace environments.
• Safety Integration: Designed as a genuine OEM part to meet exact manufacturer safety standards for gas and electric furnaces.

Common Questions

What causes a Lennox 56W24 limit switch to trip frequently?
Frequent tripping often indicates restricted airflow caused by a dirty air filter, a failing blower motor, or blocked ductwork, forcing the auto limit switch to open as a safety measure.

Is the 56W24 a manual or automatic reset switch?
This model is an automatic reset limit switch (Auto-Reset), meaning it will automatically close the circuit once the temperature drops below the lower threshold of the 180-210°F range.

Will this part work with Allied air or Armstrong units?
Yes, the 56W24 is the designated replacement for several Allied Air brands including Armstrong, Concord, and Ducane, provided the part number or temperature specs match.

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.