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Lennox 73W19 Genuine OEM Limit Control Switch 155°F Open / 125°F Close 102857-06

Name: Lennox 73W19 Genuine OEM Limit Control Switch 155°F Open / 125°F Close 102857-06
Brand: Lennox
SKU: 66255141843
Price: 65.49 USD
Availability: InStock

Low stock: 1 left

$65.49 USD

Sale Sold out

Shipping calculated at checkout.

Key Features & Specifications

Genuine Lennox 73W19 Primary Limit Switch for furnace safety.
Actuates at 155°F to prevent overheating; resets at 125°F.
5-inch STILT probe design for accurate heat exchanger monitoring.
Coded with a yellow sleeve and left-hand orientation for OEM fit.
Essential safety replacement for EL296, SLP98, and G series furnaces.

Please visit our store for pick up.

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Specifications

Product Details and Key Specifications:

Part Number: 73W19 (Model: 102857-06)
Manufacturer: Lennox (Genuine OEM)
Part Type: High Limit Control Switch (STILT Style)
Open Temperature: 155°F (68°C)
Close/Reset Temperature: 125°F (52°C)
Orientation: Left Hand
Probe Length: 5" OAL (Overall Length)
Sleeve Color: Yellow
Shipping Weight: 0.2 lbs

description

Lennox 73W19 Genuine OEM Limit Control Switch 155°F Open / 125°F Close 102857-06

The Lennox 73W19 (Model 102857-06) is a critical safety component designed for Lennox high-efficiency gas furnaces. Known as a Primary Limit Control, this "STILT" style sensor monitors the temperature of the heat exchanger. Its primary role is to protect your home and equipment by cutting power to the gas valve if the internal furnace temperature exceeds safe operating limits.

This specific sensor is factory-calibrated to actuate (open) at 155°F and automatically reset (close) at 125°F. Featuring a distinct yellow sleeve for easy identification and a 5-inch Overall Length (OAL), it is engineered for a "Left Orientation" mount. Choosing a Genuine OEM Lennox replacement ensures the thermal response time matches your furnace's safety profile exactly, preventing dangerous overheating or nuisance tripping.

Key Features and Function:

Precision Thermal Protection: Automatically shuts down the heating cycle at 155°F to prevent heat exchanger damage or fire hazards.
Automatic Reset Logic: Once the plenum temperature drops to 125°F, the switch closes to allow the furnace to resume normal operation.
STILT Design Integration: The 5-inch probe reaches deep into the airflow path for accurate real-time temperature monitoring.
Color-Coded Identification: Features a yellow sleeve, ensuring technicians can verify the correct temperature range at a glance.

Product Details and Key Specifications:

Part Number: 73W19 (Model: 102857-06)
Manufacturer: Lennox (Genuine OEM)
Part Type: High Limit Control Switch (STILT Style)
Open Temperature: 155°F (68°C)
Close/Reset Temperature: 125°F (52°C)
Orientation: Left Hand
Probe Length: 5" OAL (Overall Length)
Sleeve Color: Yellow
Shipping Weight: 0.2 lbs

🛠️ HVAC Depot Pro Tip: Airflow & Tripping

If your new 73W19 limit switch continues to trip ("open"), the problem is rarely the switch itself. A limit trip usually indicates restricted airflow. Before replacing the part, check for a dirty air filter, blocked return vents, or a failing blower motor. A "tripped" limit is often the furnace's way of telling you it can't breathe.

Cross-Reference & Compatibility:

The 73W19 is a direct OEM replacement for the following part numbers:

Lennox Numbers: 102857-06, 73W1901, L155-30F
Industry Cross-Refs: 36TX11, 20352

Extensive Model Compatibility List:

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

EL Series: EL296UHV, EL296DFV, EL195UH, EL195E
SLP Series: SLP98UHV, SLP98DFV
G Series: G61MPV, G71MPP, G40UH, G50UH
ML Series: ML195UH, ML180UH

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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Questions? We’ve got you covered

Can anyone buy from your store, or do I need to be a licensed contractor?

We are open to the public! Homeowners, landlords, and DIYers are all welcome—no license required.

What kinds of HVAC parts do you sell?

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Do you sell parts for specific brands like Trane, Goodman, or Lennox?

Yes, we stock OEM and compatible replacement parts for major brands including Trane, Goodman, Lennox, Carrier, Rheem, and others.

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Absolutely! Bring in the part, model number, or a picture, and our team will help match you with the correct replacement.

Do you offer returns or exchanges on parts?

Yes, we accept returns or exchanges within a set time period—just make sure the item is unused and in original packaging. Ask for specific terms at the counter.

Do you provide technical support or installation services?

While we don't install, we can answer basic questions and refer you to trusted local HVAC technicians if needed.

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We sell certain refrigerants, but EPA regulations require certification for purchase of products like R-410A or R-22.

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Lennox 73W19 Genuine OEM Limit Control Switch 155°F Open / 125°F Close 102857-06