OEM Lennox Gas Valve — 13H33
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30-Day Returns
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The genuine OEM Lennox 13H33 gas valve controls the flow of natural or LP gas to the burner assembly in your Lennox furnace. It opens and closes on command from the control board to deliver the precise amount of fuel needed for safe, efficient combustion, and integrates the safety shutoff and pressure regulation your Lennox system was engineered around.
Common failure symptoms: When the 13H33 fails, you may experience a furnace that ignites but won't stay lit, no heat despite a calling thermostat, delayed or rough ignition, a clicking valve that never opens, or the smell of unburned gas. Valves can stick, fail to modulate correctly, or lose their internal regulation over time.
Why OEM matters: Gas valves are safety-critical components with tightly specified pressure ratings and orifice sizing. Using the factory Lennox 13H33 guarantees correct manifold pressure, proper safety interlock behavior, and a direct bolt-in fit — protecting both your equipment and your home. Aftermarket substitutes can deliver incorrect gas flow and compromise the safety chain your Lennox furnace depends on.
Shipping Information
- Orders placed before 3PM CST ship same business day
- Standard delivery: 2-5 business days
- Express shipping available at checkout
- Free shipping on orders over $75
- Tracking number emailed upon shipment
Return Policy
- 30-day returns on unused parts in original packaging
- Electrical parts (capacitors, contactors, control boards) are final sale once installed
- Email info@nationalhvacparts.com to initiate a return
- Refunds processed within 5-7 business days