Trane CNT07541 Furnace Control Circuit Board User Manual

1. Introduction

This manual provides essential information for the installation, operation, and maintenance of the Trane CNT07541 OEM Furnace Control Circuit Board. This component is designed as a direct replacement for specific Trane gas furnace models. It functions as a 1-stage, 120V HSI (Hot Surface Ignition), 1-speed inducer control board without a cover.

Important Note: This is a factory OEM component, not a universal replacement. Ensure compatibility with your furnace model before installation.

Figure 1: Trane CNT07541 Furnace Control Circuit Board. This image displays the green circuit board with various electronic components, relays, and connectors.

2. Compatibility and Replacement Information

The Trane CNT07541 control board is specifically designed for certain Trane furnace models. Verify your furnace's production year and existing part number for correct replacement.

• For units produced in 2000 or after, use CNT07541 (or CNT07941, which supersedes it).
• For units produced in 1999 or earlier, use CNT07943.

This board replaces or supersedes the following part numbers:

• BAF00434, BAF0434, BAF-0434
• CNT03797, CNT-3797, CNT3797
• CNT-7541, CNT7541, CNT07541
• CNT7941, CNT-7941, CNT07941
• And others.

Commonly found in Trane A/TDX and A/TUX Gas Furnace Models, including but not limited to:

• AUH1B040A9241AA, AUH1B040A9241AB
• AUH1B060A9361AA, AUH1B060A9361AB
• AUH1B080A9421AA, AUH1B080A9421BA, AUH1B080A9421BB
• AUH1C080A9601AA, AUH1C100A9481AA
• AUH1D100A9601AA, AUH1D120A9601AA
• TUH1B040A9241AA, TUH1B040A9241AB
• TUH1B060A9361AA, TUH1B060A9361AB
• TUH1B080A9421AA, TUH1B080A9421BA, TUH1B080A9421BB
• TUH1C080A9601AA, TUH1C100A9481AA
• TUH1D100A9601AA, TUH1D120A9601AA

Figure 2: Trane OEM Component. This image shows a blue and red stamp indicating "Trane OEM Component", emphasizing its authenticity as a genuine part.

3. Setup and Installation

Installation of a furnace control circuit board involves electrical connections and requires specialized knowledge. Improper installation can lead to property damage, serious injury, or death. It is strongly recommended that installation be performed by a qualified HVAC technician.

3.1. Safety Precautions

• Disconnect Power: Always turn off all electrical power to the furnace at the main service panel before beginning any installation or maintenance.
• Verify Compatibility: Double-check that the new control board matches the specifications and part number of the original board.
• Static Discharge: Wear an anti-static wrist strap or frequently touch a grounded metal object to prevent electrostatic discharge (ESD), which can damage sensitive electronic components.
• Label Wires: Before disconnecting any wires from the old board, clearly label them to ensure correct re-connection to the new board.

3.2. General Installation Steps (For Qualified Technicians Only)

1. Ensure power is disconnected.
2. Access the furnace control board compartment.
3. Carefully disconnect and label all wires from the existing board.
4. Remove the old control board.
5. Install the new Trane CNT07541 board, ensuring it is securely mounted.
6. Reconnect all labeled wires to their corresponding terminals on the new board. Refer to the furnace wiring diagram if necessary.
7. Close the furnace compartment.
8. Restore power to the furnace and test its operation according to manufacturer guidelines.

Figure 3: Trane CNT07541 Circuit Board with Dimensions. This image shows the circuit board from a top-down perspective, indicating its physical dimensions as approximately 5 5/16 inches by 4 15/16 inches.

4. Operating Principles

The Trane CNT07541 control circuit board is the central control unit for your furnace's operation. It manages the sequence of operations for heating cycles, including:

• Initiating the inducer motor.
• Controlling the hot surface igniter (HSI) for ignition.
• Monitoring flame presence.
• Activating the main burner.
• Controlling the blower motor for heat distribution.
• Managing safety shutdowns in case of malfunctions.

Once properly installed, the board operates automatically in response to thermostat calls for heat and internal safety sensors. No direct user interaction with the board is required during normal operation.

5. Maintenance

The Trane CNT07541 control board itself requires minimal direct maintenance. However, ensuring the overall cleanliness and proper functioning of your furnace is crucial for the longevity of all components, including the control board.

• Annual Furnace Inspection: Have your furnace inspected and serviced annually by a qualified HVAC technician. This includes checking electrical connections, cleaning components, and verifying proper operation.
• Keep Area Clean: Ensure the area around the furnace is clean and free of dust, debris, and obstructions.
• Filter Replacement: Regularly replace or clean your furnace air filter as recommended by your furnace manufacturer. A dirty filter can restrict airflow, causing the furnace to overwork and potentially stress electrical components.

Do not attempt to clean the circuit board directly with liquids or abrasive materials. If cleaning is necessary, it should be performed by a professional using appropriate methods.

6. Troubleshooting

If your furnace is experiencing issues after the installation of a new control board, or if you suspect a control board malfunction, consider the following general troubleshooting steps. Always disconnect power before inspecting any internal furnace components.

• No Power: Check the circuit breaker for the furnace. Ensure the furnace power switch is in the "ON" position.
• No Heat/Intermittent Heat:
  • Verify thermostat settings are correct.
  • Check furnace filter for excessive dirt.
  • Inspect all wire connections on the control board for looseness or corrosion.
  • Look for diagnostic fault codes on the control board (if equipped with an LED indicator). Refer to your furnace's specific manual for code interpretations.
• Blower Not Operating:
  • Ensure the thermostat fan setting is correct.
  • Check for obstructions in the blower compartment.

For complex issues or if the problem persists, it is highly recommended to contact a certified HVAC technician. Attempting advanced repairs without proper training and tools can be dangerous and may void warranties.

7. Specifications

8. Warranty Information

Specific warranty terms for the Trane CNT07541 control circuit board are typically provided by the manufacturer or the authorized seller at the time of purchase. Please retain your proof of purchase for any warranty claims.

For detailed warranty information, it is recommended to:

• Consult the documentation included with your purchase.
• Contact the seller directly.
• Visit the official Trane website or contact Trane customer service.

9. Customer Support

For technical assistance, service, or further inquiries regarding the Trane CNT07541 control circuit board, please contact Trane customer support or an authorized Trane service provider.

You can typically find contact information on the official Trane website or through your local Trane dealer.