Lennox 31J96 Rollout Switch

The Lennox 31J96 Rollout Switch is a critical safety component designed for precise thermal monitoring in residential and commercial gas furnaces. Engineered as a manual reset flame rollout switch, this SPST (Single Pole Single Throw) device is calibrated to actuate at 320 degrees F (+/- 13°F). When the switch detects temperatures exceeding this safety threshold—often caused by blocked venting, a failing inducer motor, or a compromised heat exchanger—it breaks the 24V control circuit to immediately halt the ignition sequence, preventing hazardous flame rollout conditions. This OEM Lennox replacement part, also identified by part number 31J9601, features a closed face design and a red dot marker for rapid visual identification during service calls. As a veteran-grade component, it ensures compatibility with a wide range of Lennox-built units, including models from Allied, Armstrong, Ducane, and Magic-Pak. Professional technicians rely on this switch's robust construction and fixed-temperature trip point to maintain system integrity and meet rigorous HVAC safety standards.

• Engineered Precision: Calibrated to trigger at exactly 320°F to protect the burner box and surrounding cabinet from excessive heat.
• Manual Override Security: The manual reset feature requires a technician to physically inspect the system, ensuring underlying combustion issues are addressed before the furnace is restarted.
• Universal Compatibility: Direct OEM replacement for Lennox 31J9601 and compatible with numerous Lennox-family brands.
• Durable SPST Configuration: Designed for seamless integration into 24V furnace control circuits with high-reliability dry contacts.
• Field Serviceable: Features a red dot indicator and compact footprint for efficient diagnostics in tight burner compartments.

What causes a flame rollout switch to trip?
A tripped switch typically indicates a failure in the combustion air path. Common culprits include a restricted exhaust vent, a cracked heat exchanger, or a failing inducer motor that cannot draw flame properly into the heat exchanger tubes.

How do I test the Lennox 31J96 for continuity?
After disconnecting power, remove the wire leads and use a multimeter set to Ohms. A functional, non-tripped switch should show continuity (close to 0 Ohms). If the circuit is open and the reset button won't stay depressed, the switch requires replacement.

Is this an OEM Lennox part?
Yes, the 31J96 is a genuine Lennox OEM component, ensuring proper fitment and performance according to original manufacturer specifications.

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.