Lennox 15M43 Rollout Switch

The Lennox 15M43 Rollout Switch is a critical flame rollout safety switch designed for Lennox furnace repair and maintenance. Engineered to actuate at 270 degrees Fahrenheit (with a +/- 12 F tolerance), this OEM replacement part monitors for abnormal heat conditions in the burner compartment. As an SPST furnace switch (Single-Pole Single-Throw), it effectively opens the electrical circuit to the gas valve when temperatures exceed its calibrated threshold, preventing potential damage to the heat exchanger or external furnace components. This yellow ID color switch requires a manual reset by a technician, ensuring that any flame rollout event is professionally diagnosed before the system is placed back into operation. Built for high-temperature durability, the 15M43 replaces legacy part number 15M4301 and is compatible with a wide range of G12 and high-efficiency residential furnace models.

• Precise Safety Actuation: Calibrated to trip at 270 degrees F to provide rapid response to burner flame rollout.
• Manual Reset Mechanism: Ensures the system cannot automatically restart after a safety event, requiring a manual inspection.
• Universal Replacement: Direct OEM replacement for Lennox 15M4301, maintaining original equipment specifications.
• SPST Configuration: Simplified single-circuit control that integrates seamlessly with 24V furnace control boards.
• Durable Construction: Designed with industrial-grade materials to withstand the high-heat environment of the burner box.

• What causes a Lennox rollout switch to trip? Typically, a trip is caused by a cracked heat exchanger, soot buildup in the burner, or insufficient draft, causing flames to "roll out" toward the controls.
• Can I bypass the manual reset for testing? No. This is a primary safety device; bypassing or ignoring a tripped switch can lead to hazardous operating conditions.
• Is the Lennox 15M43 compatible with other brands? This is an OEM part specifically for Lennox-manufactured equipment, though it may cross-reference with some Armstrong or AirEase units.

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.