Vaillant F75 Fault Code: Understanding Pump or Pressure Sensor Failure and How to Fix It
At My Perfect Boiler, we understand how essential it is to have a reliable boiler, especially during the colder months. If you’ve encountered the F75 fault code on your Vaillant boiler, it indicates a problem with the pump or pressure sensor. This blog will walk you through what the F75 error means, its causes, and how you can fix it.
What Does the Vaillant F75 Fault Code Mean?
The F75 fault code appears when your Vaillant boiler detects an issue with either the pump or the pressure sensor. These components are crucial for ensuring that the water circulates correctly through the system. The pump is responsible for moving the water around, and the pressure sensor monitors the system’s water pressure.
When either of these components fails or malfunctions, the system cannot function correctly, leading to the F75 fault. The boiler will lock itself out as a safety precaution to prevent further damage.
Common Causes of the F75 Fault Code
- Pump Failure
- If the pump isn’t operating correctly, the water cannot circulate through the system. This can be caused by a mechanical failure, electrical fault, or blockage.
- Pressure Sensor Malfunction
- The pressure sensor monitors the water pressure in the system. If it fails, the boiler may misread the pressure levels, causing the F75 fault.
- Blocked or Frozen Pipes
- Blockages or frozen pipes can prevent the water from flowing through the system, which can lead to a drop in pressure or stop the pump from functioning.
- Electrical Issues
- Faulty wiring, electrical connections, or issues with the PCB (Printed Circuit Board) can affect the communication between the pump and the pressure sensor.
How to Fix the Vaillant F75 Fault Code
1. Check the Water Pressure
- The first step is to check the water pressure on your boiler’s pressure gauge. If it’s low, you’ll need to re-pressurise the system. Use the filling loop (a flexible silver hose) to add water until the pressure reaches around 1.0 to 1.5 bar.
2. Inspect the Pump
- Check if the pump is running. You should hear a slight humming sound if it’s working correctly. If the pump is silent, there may be an electrical fault, or it could be blocked.
- If the pump is blocked or jammed, you may need to clean it or, in some cases, replace it.
3. Check for Frozen or Blocked Pipes
- In cold weather, pipes can freeze, leading to low pressure or no circulation. Inspect visible pipes for any signs of frost and thaw them gently with warm (not boiling) water.
- If the issue is a blockage, you may need to contact a professional to clean or replace the affected pipes.
4. Reset the Boiler
- After checking and resolving any of the above issues, try resetting the boiler. This can sometimes help the system recalibrate and clear the fault. Always follow the reset instructions in your boiler’s manual.
5. Call a Gas Safe Engineer
- If none of these steps resolve the issue, it’s time to call a qualified Gas Safe registered engineer. They can inspect the pump, pressure sensor, and electrical components to identify the root cause and make the necessary repairs or replacements.
How to Prevent the F75 Fault Code in the Future
- Regular Boiler Servicing
- Annual servicing ensures that your pump and pressure sensor are functioning properly and can help identify potential issues before they cause major problems.
- Monitor Water Pressure
- Keep an eye on your boiler’s pressure gauge and address any drops in pressure promptly.
- Insulate Pipes
- Insulating exposed pipes, particularly in cold weather, can help prevent freezing and blockages that affect your boiler’s performance.
Why Choose My Perfect Boiler?
At My Perfect Boiler, we specialise in diagnosing and fixing faults with Vaillant boilers, including the F75 error code. Our Gas Safe registered engineers have the experience and expertise to resolve any issues quickly, ensuring that your heating system stays in top condition.
If your boiler is displaying the F75 fault code, don’t hesitate to get in touch with us. We’re here to provide reliable solutions for all your boiler-related needs.
Contact Us Today
Call My Perfect Boiler for fast and efficient boiler repairs in Essex. Let us help you get your home warm and comfortable again.
