OEM Lennox 2-Stage Natural Gas Valve — 11L08

The genuine OEM Lennox 11L08 (factory reference 103181-05) is a two-stage natural gas valve that regulates fuel delivery to your furnace burners across two firing rates. By operating on low stage for milder conditions and high stage on demand, it delivers quieter, more efficient, and more even heating than a single-stage valve — matching the staged operation your Lennox furnace was built to use.

Symptoms of a failing two-stage gas valve include the furnace being stuck on a single firing rate, no ignition, burners that light then drop out, delayed ignition, or the control board reporting a gas valve or flame fault. Short cycling and uneven temperatures can also point to a valve that no longer stages correctly.

Because gas control directly affects both safety and efficiency, the OEM Lennox 11L08 is the right choice. It is calibrated to the exact low- and high-stage pressures, coil voltage, and connections your Lennox system expects, so you avoid the combustion and staging problems that generic valves can introduce while keeping your equipment within factory spec.