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Lennox 73K38, Spark Ignitor, 2.65" Electrode Length 73K3801

Name: Lennox 73K38, Spark Ignitor, 2.65" Electrode Length 73K3801
Brand: Lennox
SKU: 66255131954
Price: 45.65 USD
Availability: InStock

Low stock: 1 left

$45.65 USD

Sale Sold out

Shipping calculated at checkout.

Key Features & Specifications

Genuine Lennox OEM Spark Ignitor
2.65" Electrode Length with L-Shaped Bracket
High-Voltage Direct Spark Ignition (DSI)
Direct Replacement for P/N 73K3801 & 43K31
Reliable Ignition for 80MGF Series Furnaces

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Specifications

Product Details and Key Specifications:

Part Number: 73K38
Manufacturer: Lennox (Genuine OEM)
Model/Part Number: 73K3801
Part Type: Spark Ignitor / Spark Electrode
Electrode Style: L-Shaped
Electrode Length: 2.65" (approx. 2 5/8")
Gross Shipping Weight: 1 LB

description

Lennox P/N 73K38 (73K3801) – Genuine OEM Spark Ignitor (DSI) Assembly

The Lennox 73K38 (Catalog 73K38) is a genuine OEM Direct Spark Ignitor (DSI) and flame sensor assembly designed for specialized Lennox, Armstrong, and Ducane gas furnaces. Unlike standard hot surface ignitors, this component uses high-voltage electricity to create a consistent spark that instantly ignites the gas burners. It plays a critical role in the furnace's automated ignition sequence, ensuring efficient combustion and safe operation throughout the heating cycle.

Being a Genuine OEM part from Lennox ensures precise timing and reliable sparking under demanding combustion conditions. This assembly features a durable 2.65" electrode length and a compact "L-shaped" bracket for easy integration into the burner housing. Choosing the original factory replacement guarantees accurate fitment and supports the intended system safety protocols, preventing the erratic ignition issues common with low-quality aftermarket electrodes.

Key Features and Function:

Direct Spark Ignition (DSI): Delivers a consistent, high-voltage spark for fast and reliable burner startups.
Genuine OEM Reliability: Official Lennox replacement engineered for accurate fit and long-term durability in high-heat environments.
Integrated Design: Serves as both the ignition electrode and the flame sensing rod in specific DSI-equipped models.
Durable Build: Constructed to withstand the harsh conditions of the combustion chamber without degradation.

Product Details and Key Specifications:

Part Number: 73K38
Manufacturer: Lennox (Genuine OEM)
Model/Part Number: 73K3801
Part Type: Spark Ignitor / Spark Electrode
Electrode Style: L-Shaped
Electrode Length: 2.65" (approx. 2 5/8")
Gross Shipping Weight: 1 LB

🛠️ HVAC Depot Pro Tip: The Electrode Gap

For a reliable spark, the gap between the electrode tip and the burner surface must be exact (typically around 1/8"). Over time, heat can cause electrodes to warp. When installing the 73K3801, always verify the gap matches the manufacturer's specification. A gap that is too wide will fail to spark, while one that is too narrow may ground out and prevent ignition.

The 73K3801 is a direct OEM replacement for the following part numbers:

OEM & Catalog Numbers:
73K38, 73K3801, 43K31.
Reference Numbers:
PSE-L39, Ref: L39, Ignitor DSI.

Extensive Model Compatibility List:

Note: Use 'CTRL+F' to search for your specific model:

Lennox 80MGF Series:
80MGF2-45A, 80MGF2-60A, 80MGF2-75A, 80MGF2-75S, 80MGF3-75A-1.
Other Compatible Models:
Various Lennox furnaces using DSI technology, including specific configurations for model 62K50.

Specification

Refund policy

Refund & Return Policy

Last Updated: June 2026

At HVAC Parts & Equipment Depot, customer satisfaction is important to us. This Refund & Return Policy explains how returns, exchanges, and refunds are handled for purchases made through TopHVACParts.com.

Return Eligibility

We accept returns within 30 days of delivery.

To qualify for a return:

The item must be unused, uninstalled, and in its original condition.
The item must be returned in its original packaging.
Model numbers and serial numbers must match the original purchase records.
Proof of purchase or order confirmation is required.

Non-Returnable Items

The following items are not eligible for return or refund:

Installed or used parts.
Products showing signs of installation, modification, or damage caused after delivery.
Items missing original packaging.
Sale or clearance items.
Special-order or custom-order products.
Returns requested more than 30 days after delivery.

Restocking Fee

Approved returns may be subject to a 20% restocking fee.

The restocking fee will be deducted from the refund amount after the returned item has been inspected and approved.

Damaged, Defective, or Incorrect Items

If you receive a damaged, defective, or incorrect item, please contact us within 7 days of delivery.

Email: support@tophvacparts.com
Phone: (214) 734-5222

We may request photographs and additional information to help process your claim.

If the claim is approved, we will provide a replacement, exchange, or refund at no additional cost to you.

Exchanges

We replace items only if they are defective, damaged upon arrival, or incorrectly shipped.

To request an exchange, contact us at:

support@tophvacparts.com

Refund Process

Once your return is received and inspected, we will notify you by email regarding approval or rejection of your refund request.

If approved:

Refunds will be issued to the original payment method.
Processing typically takes 7–14 business days after approval.
Your financial institution may require additional time before the refund appears in your account.

Return Shipping

Customers are responsible for return shipping costs unless the return is the result of:

Our shipping error,
A defective product,
A damaged product received upon delivery.

Original shipping charges are non-refundable.

We recommend using a trackable shipping service and purchasing shipping insurance for higher-value items.

Return Address

HVAC Parts & Equipment Depot
1135 E Plano Parkway, Suite 8
Plano, TX 75074
United States

Professional Installation Notice

Many HVAC products require installation by a licensed HVAC professional.

HVAC Parts & Equipment Depot is not responsible for damages resulting from improper installation, misuse, unauthorized modifications, or failure to follow manufacturer instructions.

Special Orders

Special-order products must be picked up within 30 days of purchase unless other arrangements have been approved.

Unclaimed special-order products may be returned to the manufacturer and may be subject to applicable restocking fees.

Contact Us

If you have questions regarding returns, refunds, or exchanges, please contact us:

HVAC Parts & Equipment Depot

Phone: (214) 734-5222
Email: support@tophvacparts.com

Refund & Return Policy

Last Updated: June 2026

Return Eligibility

We accept returns within 30 days of delivery.

To qualify for a return:

The item must be unused, uninstalled, and in its original condition.
The item must be returned in its original packaging.
Model numbers and serial numbers must match the original purchase records.
Proof of purchase or order confirmation is required.

Non-Returnable Items

The following items are not eligible for return or refund:

Installed or used parts.
Products showing signs of installation, modification, or damage caused after delivery.
Items missing original packaging.
Sale or clearance items.
Special-order or custom-order products.
Returns requested more than 30 days after delivery.

Restocking Fee

Approved returns may be subject to a 20% restocking fee.

The restocking fee will be deducted from the refund amount after the returned item has been inspected and approved.

Damaged, Defective, or Incorrect Items

If you receive a damaged, defective, or incorrect item, please contact us within 7 days of delivery.

Email: support@tophvacparts.com
Phone: (214) 734-5222

We may request photographs and additional information to help process your claim.

If the claim is approved, we will provide a replacement, exchange, or refund at no additional cost to you.

Exchanges

We replace items only if they are defective, damaged upon arrival, or incorrectly shipped.

To request an exchange, contact us at:

support@tophvacparts.com

Refund Process

Once your return is received and inspected, we will notify you by email regarding approval or rejection of your refund request.

If approved:

Refunds will be issued to the original payment method.
Processing typically takes 7–14 business days after approval.
Your financial institution may require additional time before the refund appears in your account.

Return Shipping

Customers are responsible for return shipping costs unless the return is the result of:

Our shipping error,
A defective product,
A damaged product received upon delivery.

Original shipping charges are non-refundable.

We recommend using a trackable shipping service and purchasing shipping insurance for higher-value items.

Return Address

HVAC Parts & Equipment Depot
1135 E Plano Parkway, Suite 8
Plano, TX 75074
United States

Professional Installation Notice

Many HVAC products require installation by a licensed HVAC professional.

HVAC Parts & Equipment Depot is not responsible for damages resulting from improper installation, misuse, unauthorized modifications, or failure to follow manufacturer instructions.

Special Orders

Special-order products must be picked up within 30 days of purchase unless other arrangements have been approved.

Unclaimed special-order products may be returned to the manufacturer and may be subject to applicable restocking fees.

Contact Us

If you have questions regarding returns, refunds, or exchanges, please contact us:

HVAC Parts & Equipment Depot

Phone: (214) 734-5222
Email: support@tophvacparts.com

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Lennox 73K38, Spark Ignitor, 2.65" Electrode Length 73K3801