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Lennox 26W42 – Genuine OEM 2-Stage Pressure Switch (0.95" / 0.55" W.C., 101126-03) On-Line Only

Name: Lennox 26W42 – Genuine OEM 2-Stage Pressure Switch (0.95" / 0.55" W.C., 101126-03) On-Line Only
Brand: HVAC Parts and Equipment Depot
SKU: 101126-03
Price: 88.00 USD
Availability: InStock

Low stock: 1 left

$88.00 USD

Sale Sold out

Shipping calculated at checkout.

Key Features & Specifications

Genuine Lennox OEM Two-Stage Furnace Pressure Switch
Dual Set Points: 0.55" W.C. (Low) and 0.95" W.C. (High)
Critical Safety Component for Inducer Draft Verification
Direct Replacement for Catalog 26W42 and Part 101126-03
Durable Construction for High-Efficiency Condensing Furnaces

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Specifications

Brand
Lennox
Catalog Number
26W42
Model/Part Number
101126-03
Base Unit of Measure
Unit(S)
Type
2-Stage Pressure Switch
Gross Weight
0.48 LB
Type
2-Stage Pressure Switch
Pressure Settings
Set Point High 0.95" W.C.; Set Point Low 0.55" W.C.
Additional Information
Contact Rating: 5 Amp Resistive at 24 VAC
Configuration
SPST-N.O. Contact

description

Lennox 26W42 – Genuine OEM 2-Stage Pressure Switch (0.95" / 0.55" W.C., 101126-03)

The Lennox 26W42 (Model 101126-03) is a high-precision Genuine OEM 2-Stage Pressure Switch designed for Lennox and Armstrong Air high-efficiency gas furnaces. This dual-action safety device monitors the combustion air pressure generated by the inducer motor, ensuring that exhaust gases are being properly vented at both low-fire and high-fire stages before the gas valve is permitted to open.

Technical Performance:

Engineered specifically for two-stage heating systems, this switch features two distinct calibrated set points: a Low-Stage set point of 0.55" W.C. and a High-Stage set point of 0.95" W.C.. This ensures that the furnace operates safely across varying inducer speeds. If the venting system becomes restricted or the inducer motor underperforms at either stage, the switch will break the 24V control circuit, instantly shutting down the ignition process to prevent a carbon monoxide hazard.

Key Features and Function:

Feature 1: Dual-Stage Pressure Monitoring: Specifically calibrated to manage the safety requirements of both low-heat and high-heat cycles.
Feature 2: Precision Calibration: Set at 0.55" and 0.95" Water Column (W.C.) to maintain strict factory-specified venting tolerances.
Feature 3: Fail-Safe Safety Integration: Normally-open contacts ensure the furnace cannot fire if the inducer fan is not creating a sufficient vacuum.
Feature 4: Corrosion-Resistant Diaphragm: Built with high-grade internal components to resist the moisture and acidic condensate found in 90%+ AFUE furnace vents.

Product Details and Key Specifications:

Catalog Number: 26W42
Model/Part Number: 101126-03
Manufacturer: Lennox / Allied Air (Genuine OEM)
Part Type: 2-Stage Air Pressure Switch
High-Stage Set Point: 0.95" W.C.
Low-Stage Set Point: 0.55" W.C.
Voltage: 24 VAC Control Circuit
Shipping Weight: 0.4 lbs

🛠️ HVAC Depot Pro Tip: The "Blocked Drain" Logic

In high-efficiency furnaces, a tripped 26W42 switch doesn't always mean the inducer or switch is bad. Often, a clogged condensate drain line will back up water into the inducer housing, blocking the pressure signal. Before replacing the switch, blow through the pressure tubing and check your furnace's trap and drain lines for clogs that might be causing "nuisance" trips.

Cross-Reference & Compatibility:

The 26W42 is a direct OEM replacement for the following part numbers:

OEM Numbers: 101126-03, 10112603, 26W4201, 101126-01
Industry Refs: MPL-9300-V-0.55/0.95-DEB

Extensive Model Compatibility List:

Lennox G61MPV Series: G61MPV-36B-070, G61MPV-36C-090, G61MPV-60C-090, G61MPV-60D-135
Lennox G60UHV Series: G60UHV-36B-070, G60UHV-60C-090, G60UHV-60D-135
Armstrong Air / AirEase: 95% AFUE 2-Stage models matching 0.55/0.95 specs.

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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William Bartlett

Cecil really saved me with troubleshooting tips over the phone. Thought I was going to have to replace the blower motor and ended up only needing a motor run capcitor. Thank you and God bless!

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Cecil and Fidel were absolutely amazing and so helpful. We were happy they were open on Sunday, but was impressed with their knowledge and willingness to make sure we had everything we needed. If you need parts or service or install, I would recommend.

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Our AC went out during the hottest stretch of summer, and with a one-year-old at home, we were desperate for a quick fix. These guys came through big time — not only did they source the part faster than anyone else in the area, they also walked me through DIY troubleshooting while I waited. Trustworthy, knowledgeable, and run by a solid local family. As someone who owns rental properties nearby, I’ll be sourcing all my HVAC parts from them moving forward. Highly recommend!

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Had a power outage last night and during the 100 degree heat today noticed that the AC was not blowing any cold air. Pulled the capacitors to have them checked and also took video of the relay making noise even with the breaker was off. The proprietor and her staff were very friendly and helpful. She had the video analyzed and confirmed something was wrong. She checked one of the capacitors was a little low. Capacitor replacement is the biggest ticket item for HVAC repair. It is hundreds of dollars with the a capacitor only about $20.

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Cecil and his family have been a life saver. I walked in with very little knowledge on parts let alone how to repair my unit. All I had was my brother in FL who knows more than I do and Cecil at HVAC Depot. With 2 young kids at home I couldn't afford to wait for a HVAC tech. Cecil walked me through what I needed to know, even after hours when the shop closed. I successfully repaired the fan motor and replaced the capacitor. Thank you HVAC team for being totally awesome. Prices were amazing and I'm forever going to support this small family business. You and your family are what Texas is all about!!!

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I called HVAC Depot and was absolutely blown away by the fast, courteous and exceptional service. They were very knowledgeable about explaining what they were doing and what had happened to the ac system. If you ever need a HVAC team they are best and they won’t hesitate by coming out and they won’t leave until you are happy with the service. Thank you so much for your excellent service. Kudos to you Michelle for your amazing customer service.

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Paul Hamer

My AC went out in our home on Friday night. I went out and got the capacitor details and took them here first thing Saturday morning. Lady at the counter was friendly and had the capacitor I needed! When I got home, I installed the capacitor and AC is all good!!

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Awesome support and had everything I needed for an older unit! Then helped me out with the DIY!! Air conditioning back up and running at 100%!!
Thanks for everything

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Frequently Asked Questions

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?

We carry blower motors, fan motors, capacitors, control boards, contactors, thermostats, filters, copper lines, refrigerants, and more.

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.

Can you help me find the right part for my system?

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.

Do you sell refrigerants to the public?

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

Do you ship parts, or is it in-store only?

We offer both! You can shop in person or call to arrange shipping if you're out of town.

Lennox 26W42 – Genuine OEM 2-Stage Pressure Switch (0.95" / 0.55" W.C., 101126-03) On-Line Only