Lennox 86H72 190F Limit Switch

The Lennox 86H72 190F Limit Switch is a critical safety component designed for high-performance temperature regulation in residential and commercial heating systems. This genuine OEM Lennox part features an auto-reset configuration, engineered to interrupt burner operation when the plenum temperature reaches the 190°F high-limit threshold. Once the system cools to the 160°F reset point, the switch automatically closes the circuit, allowing for continued furnace operation. Built with a 7-inch sensing probe, the 86H72 provides precise thermal monitoring, protecting the heat exchanger and surrounding components from catastrophic overheating. As a veteran-grade HVAC replacement limit switch, it is a direct drop-in for numerous Allied, Armstrong, Ducane, and Magic-Pak models. Utilizing an L190-30 limit control profile, this switch ensures your equipment maintains rigorous safety standards while minimizing nuisance trips caused by minor airflow fluctuations. For contractors, this is the standard-issue furnace high limit switch required for maintaining the integrity of Lennox G20, G61, and G71 series units.

• Precise Thermal Protection: Factory-calibrated to open at 190°F and reset at 160°F, ensuring the system stays within safe operating parameters.
• Extended 7-Inch Probe: The long-reach sensing element allows for accurate temperature detection deep within the airflow path.
• Automatic Reset Logic: Eliminates the need for manual intervention after the system has safely cooled down.
• Broad Compatibility: An essential furnace repair part that cross-references with part numbers 86H7201 and 20516703.
• Rugged OEM Construction: Designed to withstand the high-cycle demands of modern high-efficiency furnaces and rooftop units.

• What causes this limit switch to trip repeatedly? Frequent tripping is usually a symptom of restricted airflow, often caused by a heavily soiled air filter, blocked return vents, or a failing blower motor.
• Can I use this as a substitute for a manual reset switch? No. Safety controls must always match the original manufacturer specifications. Replacing a manual reset with an auto-reset limit switch can bypass critical diagnostic requirements for the heating system.
• How do I verify if the 86H72 is faulty? Using a multimeter, check for continuity across the terminals at room temperature. If the circuit is open while the switch is cool, the internal bimetal disc has likely failed and requires immediate replacement.

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.