The F75 Vaillant Fault Code Error and How to Clear It

The F75 Vaillant fault code is a common issue encountered by homeowners with Vaillant boilers. This error code indicates a problem that needs immediate attention to ensure your boiler operates efficiently.

Understanding what this code means and how to address it can save you from potential heating disruptions and costly repairs.

So let’s jump right in.

What Does an F75 Vaillant Fault Code Mean on Your Boiler?

When your boiler displays the F75 Vaillant fault code, it signifies a failure in detecting sufficient pressure rise from the pump within a specified time. This issue is typically caused by either a defective pump or a faulty pressure sensor. Both components are critical for the proper circulation of water through the heating system.

Resolving the F75 error on a Vaillant boiler involves troubleshooting whether the problem lies with the pump or the pressure sensor. Follow these steps to address it effectively:

  1. Reset the Boiler: Begin by resetting your boiler to clear any minor glitches. Refer to your boiler’s manual for specific reset instructions.
  2. Inspect the Pump: Listen for any unusual noises from the pump. If the pump is silent or making irregular sounds, it might be defective and need replacement.
  3. Check the Pressure Sensor: If the pump appears to be functioning correctly, the pressure sensor could be faulty. Clean the sensor to remove any debris or consider replacing it to restore proper functionality.
  4. Seek Professional Assistance: If you’re uncertain about diagnosing or fixing the issue yourself, contact a qualified heating engineer. They can accurately diagnose the problem and recommend the necessary repairs.

Is My Boiler’s Pump Defective or Is It the Pressure Sensor?

Differentiating between a defective pump and a faulty pressure sensor can be challenging. Here are some indicators to help you determine the problematic component:
  • Pump Issues: A noisy pump or one that fails to operate indicates potential pump failure.
  • Pressure Sensor Problems: If the pump is functioning, but the F75 Vaillant fault code persists, the pressure sensor likely requires attention.

What Causes a Pump to Fail Inside a Vaillant Boiler?

Several factors contribute to pump failure in a Vaillant boiler:
  1. Wear and Tear: Continuous operation over time can lead to natural wear and tear of the pump.
  2. Blockages: Accumulation of debris and sludge within the system can obstruct the pump, causing it to malfunction.
  3. Electrical Issues: Faulty wiring or electrical components can disrupt the pump’s performance, leading to failure.

What Causes a Faulty Pressure Sensor?

A pressure sensor in a Vaillant boiler may malfunction due to various reasons:
  1. Accumulation of Debris: Buildup of dirt and debris can impair the sensor’s ability to accurately detect pressure changes.
  2. Age-related Degradation: Over time, the sensor may deteriorate, affecting its responsiveness.
  3. Moisture Exposure: Exposure to moisture can damage the internal components of the pressure sensor, causing it to malfunction.

How Can I Prevent the F75 Vaillant Fault Code Error?

To prevent encountering the F75 Vaillant fault code, implement these maintenance practices:
  1. Regular Maintenance: Schedule annual servicing by a qualified engineer to inspect and maintain all boiler components.
  2. System Flushing: Periodically flush the heating system to remove accumulated debris and sludge that could impair pump and sensor function.
  3. Routine Inspections: Regularly check your boiler and surrounding pipes for leaks or signs of wear that could affect pressure levels and trigger the F75 fault.
Top Tip: Ensure your Vaillant boiler stays reliable by scheduling annual maintenance. This proactive step helps prevent the F75 Vaillant fault code and ensures your boiler operates smoothly year-round.  

Dealing with the F75 Vaillant fault code requires prompt attention and proper diagnosis. Whether it’s a pump issue or a faulty pressure sensor, addressing the problem promptly can ensure your Vaillant boiler operates efficiently. By following regular maintenance routines and seeking professional assistance when needed, you can prevent the inconvenience of the F75 Vaillant error and maintain a reliable heating system for your home.

For a quick response, please call an engineer to look into the issue.  

The F75 Vaillant Fault Code Error and How to Clear It
The F75 Vaillant fault code is a common issue indicating problems with pressure rise detection in the boiler's pump. It typically stems from a faulty pump or pressure sensor. To resolve it, consider resetting the boiler, checking the pump's operation, inspecting the pressure sensor, or seeking professional help. Regular maintenance, such as annual servicing and system flushing, can prevent this issue, ensuring your Vaillant boiler runs efficiently and reliably.


The above content is just for the customer information. Please call the respective engineers to come and look into the issue.  

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