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Vaillant Boiler Fault Codes : F75, F22, and F28

Discovering vaillant boiler fault codes can be a stressful experience, especially when faced with issues like F75, F22, or F28. 

In this blog, we’ll delve into each of these error codes, focusing on the specific challenges they pose and how 

Response Boiler Repair Engineers in Liverpool can come to your aid. No call-out charge.

Vaillant F75

Section 1: “Unraveling the Vaillant F75 Error Code for Swift Repairs”

Response Boiler Engineer will help you find and repair.

  • Vaillant F75 Fault Code Overview
  • Causes of the F75 Error Code: Faulty Pump, Water Pressure Sensor, or Leaks
  • Fixing the F75 Error: Importance of a Gas Safe-Registered Engineer
  • Diagnosing Pump or Pressure Sensor Issues
  • Preventive Measures: Annual Servicing and Power Flushing

What steps can be taken to avoid encountering the Vaillant boiler F75 fault code error? The most effective preventive measure is to schedule an annual servicing. During this routine maintenance, Response Boiler engineers will thoroughly inspect for potential issues such as leaks and component damage. Additionally, they will perform a basic cleaning procedure to remove debris from the pressure sensor. Adhering to the annual servicing schedule is not only a recommended practice but is often a requirement for most manufacturer warranties, including those offered by Vaillant. This proactive approach to maintenance can ultimately translate into long-term cost savings for homeowners.

Vaillant F22

Section 2: “Deciphering the Vaillant F22 Fault Code: A Homeowner’s Guide”

Response Boiler Engineer will help you find and repair.

  • Understanding the Vaillant F22 Fault Code
  • Causes of the F22 Error: Water Pressure and Flow Rate Issues
  • Signs of the F22 Fault: ‘Locked Out’ State and Pressure Gauge Readings
  • Root Causes: Leaks, Expansion Vessel Issues, and Pressure Release Valve Problems
  • Repressurising your Vaillant Boiler: Step-by-Step Guide
  • Seeking Professional Assistance for Persistent F22 Issues      
  • The appearance of the F22 error code on your Vaillant boiler signals a challenge related to water pressure or flow rate, commonly called poor circulation. Specifically, the code indicates that the water pressure is insufficient for the boiler to function, leading to a potential ‘locked out’ state and a lack of hot water along with cold radiators. It’s worth noting that at times, this issue might also trigger the F75 fault for similar reasons.
  • Observing a numerical value like 0.3 flashing on your boiler’s display reveals the current pressure level in your system, typically expected to be around 1.5 bar, depending on your specific boiler model. To confirm this matter, you can cross-verify with the pressure gauge, if your boiler is equipped with one.
  • In the context of heat-only Vaillant boilers, a low-pressure scenario may signify a circulation problem, often associated with issues in the pump, potential airlocks, or scaling in the main heat exchanger.
  • A helpful tip: If your Vaillant boiler has a gauge, and topping up the pressure doesn’t reflect an increase, gently tapping the gauge during the pressure adjustment might free the pressure gauge needle.
  • Identifying the root causes of low water pressure or circulation issues is crucial. Factors contributing to a pressure drop in your boiler system include leaks in the pipework, problems with the expansion vessel, or a malfunctioning pressure release valve. It’s essential to be aware that bleeding your radiators recently could lead to a temporary pressure reduction. However, the F22 fault often arises due to the natural contraction and expansion in the heating system, resulting in a certain amount of water volume loss,

Vaillant F28

Section 3: “Navigating the Vaillant F28 Error Code: A Winter Problem”

  • Vaillant F28 Error Code Meaning
  • Causes of the F28 Error: Ignition or Gas Valve Problems
  • Understanding Boiler Error Codes
  • Importance of Assessing and Diagnosing F28 Causes
  • Common Causes: Mechanical Faults with Gas Valve and Frozen Condensate Pipe
  • Thawing a Frozen Condensate Pipe: Safe Methods

Vaillant F28 Code Significance

Response Boiler Engineer will help you find and repair.

The Vaillant F28 code officially indicates an ignition fault, and its complexity arises from the potential involvement of various internal issues. The F28 warning code is activated when the boiler experiences three failed ignition attempts.

Given the extensive range of potential causes, the F28 can be broadly categorized as both a gas valve and an ignition problem. The ignition process is vital for lighting the gas, creating a flame that heats the cold water, ultimately providing the property with a supply of hot running water. The gas valve plays a crucial role in controlling the flow of gas within the boiler.

Experiencing an F28 error code can lead to a boiler ‘lockout,’ a shutdown mechanism designed to prevent further faults. While the instinct may be to restart the boiler to restore central heating quickly, exercising patience is advisable.

Conducting thorough assessments and diagnosing the root cause of the issue can offer significant long-term benefits. This approach allows for a comprehensive remedy, avoiding partial fixes that may lead to recurring breakdowns.


When faced with Vaillant boiler fault codes like F75, F22, or F28, it’s crucial to act promptly and seek the expertise of a Gas Safe-registered engineer.

Response Boiler Repair Engineers in Liverpool are ready to fault-find and decode these error messages, providing effective solutions to ensure your heating system runs smoothly throughout the seasons.

 Don’t let boiler issues leave you cold – trust the experts for reliable repairs and peace of mind.

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