OEM Lennox Gas Valve — 29K43

The genuine OEM Lennox 29K43 gas valve controls and regulates the flow of natural gas or propane to the burners in your Lennox furnace. Working in concert with the ignition control and safety circuits, it opens to deliver fuel during a call for heat and closes to shut off the supply, delivering safe, precisely metered combustion every cycle.

Common failure symptoms: A failing 29K43 gas valve typically produces no heat, delayed or rough ignition, burners that light and then quickly go out, a clicking igniter with no flame, or a gas smell around the furnace. Because the gas valve is a safety-critical component, any of these symptoms warrant prompt replacement.

Why OEM matters: A gas valve manages combustible fuel, so precise pressure regulation and a guaranteed-tight shutoff are non-negotiable. The OEM Lennox 29K43 is factory-matched to your furnace's manifold pressure, wiring, and control logic, ensuring proper fit and safe operation. Universal replacements often require adapters and manual pressure setup that can introduce risk — the genuine Lennox valve installs as a direct, spec-correct replacement.