OEM Guaranteed
Same-Day Ship
30-Day Returns
Secure Checkout
The Lennox 58L71 (factory reference LB-94731F) burner assembly is the component that mixes gas and air and delivers a controlled flame into the heat exchanger of your Lennox furnace. Proper burner condition is essential for efficient, clean-burning operation and consistent heat output. This is a genuine OEM replacement assembly designed to match the original specifications.
Worn or fouled burners commonly cause hard starts, delayed or rough ignition, flame rollout, soot buildup, uneven flames, or a furnace that trips the flame sensor and locks out. If your system is producing yellow flames, popping noises at ignition, or intermittent no-heat calls, the burner assembly is a likely culprit and should be inspected or replaced.
Why OEM matters: The 58L71 is engineered for the precise burner spacing, orifice alignment, and combustion characteristics of Lennox furnaces. Using genuine OEM parts protects combustion efficiency, flame stability, and safety-control operation. Choosing the factory assembly ensures correct fit and dependable long-term performance.