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Trane SWT03305 Furnace Pressure Switch | Genuine OEM Replacement C342634P40

Trane SWT03305 Furnace Pressure Switch | Genuine OEM Replacement C342634P40

Low stock: 7 left

Regular price $105.22 USD
Regular price Sale price $105.22 USD
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Why Pros Choose Our SWT03305 Pressure Switch For A Direct Replacement

  • Genuine OEM Quality – Factory authorized for Trane & American Standard.

  • Exact Calibration – Precisely set to -1.51" Open / -1.73" Close.

  • Fast Shipping – In-stock and ready to ship to your job site today.

  • Broad Compatibility – Replaces C342634P40 and fits dozens of furnace models.

  • Hassle-Free Returns – 30-day "Right Part" guarantee for HVAC professionals.

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Specifications

  • Brand: Trane/American Standard
  • Contact Configuration: NO
  • Number of Poles: 1
  • Pressure Rating: -1.51 In-Wc Open, -1.73 In-Wc Close
  • Shipping Weight: 0.318
  • Terminal Type: 1/4 X 0.032 Quick connect
  • Type: Pressure switch
  • Open at: -1.51 inches of water column (WC)
  • Close at: -1.73 inches of water column (WC) 

description

Trane & American Standard SWT03305 Furnace Pressure Switch

Is your furnace failing to ignite or throwing a 2 flash or 3 flash error code? The Trane SWT03305 is essential safety component your system needs to verify proper venting. This is a genuine OEM Trane and American Standard pressure switch that is used in residential furnaces to ensure safe operation by monitoring pressure levels. It is an OEM replacement part that opens at -1.51 inches of water column WC and closes at -1.73 WC. The pressure switch is a safety component that detects if there is enough air pressure for the furnace to run safely. When the pressure switch is not activated the gas valve will not open. You can find this pressure switch in Trane and American Standard Run Tru/Ameristar HVAC systems and is designed to be a genuine OEM direct replacement replacement part on residential furnaces.

Key Performance Features:

  • Genuine OEM Quality: Specifically engineered for Trane, American Standard, and Ameristar/Run Tru residential furnaces.
  • Safety First Design: Factory-calibrated to Open at -1.51" WC and Close at -1.73" WC for precise airflow monitoring.
  • Simple Swap-Out: Standard 1/4" quick-connect terminals and built-in mounting bracket mean you can get the heat back on in minutes.
  • Honeywell Engineered: Manufactured for Trane Technologies to provide superior durability in high-cycle environments.

Technical Specifications:

  • Brand: Trane/American Standard
  • Part Number: SWT03305/SWT3305
  • Contact Configuration: NO
  • Number of Poles: 1
  • Shipping Weight: 0.318
  • Terminal Type: 1/4 X 0.032 Quick connect
  • Type: Pressure switch
  • Open at: -1.51 inches of water column (WC)
  • Close at: -1.73 inches of water column (WC) 

The SWT03305 pressure switch directly replaces the following OEM part numbers: 

  • SWT3305 (shortened version)
  • SSWT03305
  • C342634P40
  • C342634P40-SP

The Trane SWT03305 assembly also cross-references to third-party and aftermarket part numbers, as it is often a Honeywell manufactured component rebranded for Trane: 

  • Ingersoll Rand SWT3305
  • Service First SSWT03305
  • Honeywell-made equivalents (specific model number often found directly on the switch itself) 

This part is found in the following model numbers:

American Standard Models:

  • AUH1B080A9421BA
  • AUH1B080A9421BB
  • AUH1B080A9421CA
  • AUH1B080A9421CB
  • AUH1B080A9H31BA
  • AUH1B080A9H31CA

Ameristar/Run Tru Models:

  • M951P080BU42ABA
  • M951P080BU42ABB
  • M951P080BU42ABC

Trane Models:

  • TUH1B080A9421BA
  • TUH1B080A9421BB
  • TUH1B080A9421CA
  • TUH1B080A9421CB
  • TUH1B080A9H31BA
  • TUH1B080A9H31CA

Troubleshooting Guide

How to Tell if Your SWT03305 has Failed:

  • Inducer motor runs, but burners won't light: The switch may be stuck "open" or the diaphragm is ruptured.
  • Pressure Switch Stuck Open Error: Check for blocked flues or cracked vacuum hoses first.
  • Visible Damage: Look for melted plastic or corroded terminals.
    Pro Tip: Use a digital manometer to verify your system is hitting at least -1.73" WC before assuming the switch is bad.

Specification

Refund policy

Refund & Return Policy

Last Updated: June 2026

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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.

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The following items are not eligible for return or refund:

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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.

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

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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

Michel & Siso are very knowledgeable and explain everything to where I could understand! Amazing experience! Thank you will always come here for any AC needs. Trustworthy and excellent customer service.

Celest G.
Verified Customer
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