What igniter fits my Lennox furnace?

The correct replacement for Lennox model OEM Lennox Spark Electrode Igniter — 20J90 is this exact part. It is the factory-specified replacement with exact OEM specifications. Using a part with different specifications can cause equipment damage or void your warranty. You can verify this by checking the data plate on your Lennox equipment which lists the model number OEM Lennox Spark Electrode Igniter — 20J90.

My furnace will not ignite. What part is bad?

A furnace that will not ignite after the draft inducer runs typically has a failed igniter. The hot surface igniter should glow bright orange within 60 seconds. If it does not glow at all, it is cracked or burned out. If it glows weakly, it is degrading and should be replaced preventively. Average lifespan: 3 to 7 years.

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Lennox

OEM Lennox Spark Electrode Igniter — 20J90

Name: OEM Lennox Spark Electrode Igniter — 20J90
Brand: Lennox
SKU: LNX-20J90
Price: 29.95 USD
Availability: InStock

SKU: LNX-20J90 Brand: Lennox

$29.95 $39.95

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The genuine OEM Lennox 20J90 spark electrode igniter delivers the high-voltage spark that lights the burners in your gas furnace. Positioned at the burner assembly, it fires during each ignition sequence to establish a reliable flame that the flame sensor then confirms. This electrode is engineered for direct fit in Lennox furnaces that specify part number 20J90.

Common failure symptoms: A worn or cracked 20J90 igniter often causes delayed ignition, repeated clicking with no light-off, or a complete failure to start the burners. You may notice the furnace attempting several ignition cycles before locking out, a small gas smell from unburned fuel, or no heat despite the blower running. Cracked ceramic insulation and eroded electrode tips are typical wear indicators.

Why OEM matters: The gap distance, electrode geometry, and insulator material of the 20J90 are matched to the spark output of your Lennox control system. Generic igniters may misfire, produce a weak spark, or fail to seat correctly, resulting in unreliable ignition and repeat service calls. The OEM electrode guarantees consistent, on-demand light-off and long service life.

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

OEM Lennox Spark Electrode Ignit...

$29.95

Frequently Asked Questions

Does this Igniter fit my Lennox OEM Lennox Spark Electrode Igniter — 20J90?

Yes. This is the factory-specified OEM igniter for the Lennox OEM Lennox Spark Electrode Igniter — 20J90. It is a direct drop-in replacement that fits without modification. Always verify the model number on your equipment nameplate before ordering.

How do I replace the igniter on my Lennox OEM Lennox Spark Electrode Igniter — 20J90?

Difficulty: Medium (20–30 min)
Step 1: Turn off power and gas. Step 2: Open furnace panel. Step 3: Locate igniter near burners. Step 4: Disconnect two-wire plug. Step 5: Remove mounting screw. Step 6: Install new igniter — do NOT touch element with fingers. Step 7: Reconnect, close panel, restore power/gas.

My furnace won’t ignite. What part is bad?

Furnace won’t ignite after the draft inducer runs = failed igniter. The hot surface igniter should glow bright orange within 60 seconds. No glow = cracked/burned out. Weak glow = degrading. Average lifespan: 3–7 years. Replacement: $15–$40 DIY.

Is this igniter compatible with Bryant or Payne too?

Many Lennox parts are cross-compatible with Bryant and Payne since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across brand labels with different model numbers. To verify: check your Bryant or Payne equipment service manual for cross-compatible part numbers, or email info@nationalhvacparts.com with your model number.

Should I use OEM or aftermarket for my Lennox igniter?

OEM recommended for reliability and warranty compatibility. OEM parts match exact factory specifications for proper fit, performance, and safety. While aftermarket alternatives cost less upfront, the risk of improper fit and reduced lifespan usually makes OEM the better value long-term.

How fast does National HVAC Parts ship?

Orders placed before 3:00 PM CST ship the same business day. Standard delivery is 2–5 business days anywhere in the continental United States. Express shipping available at checkout. We ship from Houston, TX to all 50 states. 30-day return policy on all parts.

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OEM Lennox Spark Electrode Igniter — 20J90

Shipping Information

Return Policy

Frequently Asked Questions