Lennox Furnace Parts

Lennox Furnace Parts

Lennox furnaces are built for high efficiency and long service life, but when they fail, you need genuine OEM parts that match your model's exact specifications. Whether you're replacing an igniter that won't glow, a control board showing error codes, or a pressure switch that keeps tripping, Repair Clinic stocks the genuine Lennox parts you need.

The most common Lennox furnace repairs involve hot surface igniters, inducer motors, control boards (especially iComfort communicating boards), and pressure switches. Because Lennox furnaces often feature proprietary communicating controls, using OEM parts is essential — aftermarket boards won't work with your system. Find your model number on the furnace nameplate and browse our complete inventory of Lennox furnace parts with same-day shipping available.

• Hot surface igniter won't glow or glows orange then shuts off: Silicon carbide or silicon nitride igniter, depending on model year
• Furnace won't start or keeps shutting off: Check pressure switch, draft inducer motor, or flame sensor
• Blower runs but no heat: Limit switch, gas valve, or igniter failure
• Error codes on display or LED blinks: Control board (CNT or iComfort) requires exact model match
• Loud noise from furnace or inducer motor vibration: Inducer motor assembly or bearing wear

Common Questions About Lennox Furnace Parts

What's the difference between Lennox CNT and iComfort control boards?

CNT boards are standard programmable controls found in classic Lennox models. IComfort boards are proprietary communicating controls used in Dave Lennox Signature and Elite series — they talk to thermostats and other equipment over a special wiring protocol. You'll need to use the exact OEM board for your model; aftermarket or mismatched boards will not work. Always verify your model number before ordering.

How do I know if my igniter is silicon carbide (SiC) or silicon nitride (SiN)?

The igniter type is determined by your furnace model and year of manufacture. You'll find the model number on the furnace's nameplate (usually on the side or front of the unit). Enter that model number into the Repair Clinic parts finder — it will show you the correct igniter type and ensure you get the right replacement. Installing the wrong type will prevent the gas valve from opening.

Where do I find my Lennox furnace model number?

The model number is printed on a white label attached to the furnace cabinet, typically on the side panel or front. It's also in your installation documentation. Write down the full model number (including any letter suffixes) — this one piece of information ensures you order parts that fit your exact furnace configuration and controls.

Why are Lennox parts more expensive than aftermarket alternatives?

Lennox furnaces use proprietary control systems and communicating technology. OEM boards, igniters, and other parts are engineered to work together reliably. Aftermarket parts may be cheaper but often fail prematurely or don't integrate with your controls. For Lennox, OEM is a primary reliable choice — and our same-day shipping means you'll have heat running again fast.

Order Lennox Furnace Replacement Parts Online

Find high-quality Lennox furnace replacement parts at Repair Clinic. Whether you need a Lennox furnace blower wheel, flame sensor, gas valve, or thermostat, our extensive inventory of OEM Lennox parts ensures a proper fit. Simply enter your model or part number to locate the correct replacement parts.

Lennox Furnace Model Number: Where to Look

On Lennox furnaces, look for the model number on the blower compartment door, inside the front access panel, or near the gas valve. Check the equipment label carefully and copy the complete model number, including letters, numbers, and any hyphens. Type it into our model number lookup and the catalog narrows to parts made for your unit. The model number identifies the furnace itself, so it filters the full selection across every associated part category, not just the part you are replacing. Matching the number before you order helps confirm compatibility, reduces time spent comparing specifications, and means fewer wrong orders and a faster repair.