Vaillant F75 Fault Code Error

Unfortunately, if your Vaillant Boiler displays an F75 error code, you won’t receive heating and hot water. This code appears mainly due to faulty water pressure sensors and central heating pumps. Sometimes, the reason is related to leaking pipes around your central heating system.

But there is no need to worry anymore; in this blog, I will discuss the Vaillant Boiler F75 error code in detail, the reasons behind it, and possible preventive measures. So, let’s begin.

What is an Error Code?

An error code is an alphanumeric series indicating a problem with your boiler that needs immediate attention. As a precautionary measure, when the error code is displayed, the boiler halts its operations to prevent further damage.

What Does f75 mean on your Vaillant boiler?

When your Vaillant boiler displays an f75 error code, it indicates that it cannot detect the pressure change when the pump turns on. This instance occurs due to a faulty pump or water pressure sensor.

Related Article:

Vaillant Boiler Fault Codes / Error Codes

Vaillant F28 Boiler Error / Fault Code

How to fix the f75 fault on the Vaillant boiler?

Unfortunately, there isn’t a DIY solution for fixing the f75 Vaillant boiler fault code, as the problem concerns internal components. The best course of action is to contact a gas-safe certified engineer and let him inspect the issue and solve it.

However, you can diagnose the problem and determine whether it relates to a faulty pump or water pressure sensor.

How do we know if the problem is related to a faulty pump?

To check whether the problem is related to a faulty pump or not, do the following:

• Restart your boiler.
• Open the hot water tap to fire your boiler and start the heat pump.
• Wait for the sound of the pump operating, which will cause a humming sound and vibration.
• If you hear no sound, it indicates that your pump needs repair or is broken.

Reasons behind a faulty pump?

A faulty pump is mainly due to its old age. Many modern boilers use Grundfos boiler pumps, but many old Valliant boilers use less reputable pumps. So, if you have a Valliant EcoTec boiler and the pump is not working correctly, then this indicates that it’s time to upgrade.

How do you know if the problem is related to a water pressure sensor?

If you observe that your pump is operating optimally, making sound and vibration, you still lose the hot water supply in the middle of your usage. The problem is related to a faulty water pressure sensor.

Reasons behind a faulty water pressure sensor?

Although pressure sensors in newer Vaillant boiler models are prone to collecting dirt and debris, one issue that causes faults in the water pressure sensor is magnetite. Magnetite forms when your heating system suffers from internal corrosion. It forms a layer on the pressure sensor, preventing it from registering the pressure change and resulting in a malfunctioning boiler.

In Which Vaillant boiler models does the F75 Error code occur?

The F75 error code occurs in the following Vaillant boiler models:

• Vaillant EcoTec
• Vaillant EcoTec Plus
• Vaillant EcoPro

How Much Does it cost to fix the F75 Error Code?

As mentioned above, the F75 error code occurs due to a faulty pump or water pressure sensor. Fixing the defective pump will cost between £250 and £350, excluding the labour cost. To fix the water pressure sensor issue, expect to pay between £150 and £250, excluding the labour cost.

Note: The prices mentioned above are just to give you an idea, and actual prices may vary.

How to avoid an F75 Error Code?

To prevent the F75 error code from occurring in the future, schedule an annual boiler service. Also, get a central heating power flush, or Magna cleanses every 5-6 years to ensure your heating system is free from dirt, dust, and debris, which are the leading causes of blockage and corrosion in your boiler.

However, if your boiler is too old, between 10 and 15 years, then future problems will occur no matter how actively you maintain it. If your boiler is old and causes trouble more often, the wise decision is to invest in a new one.

Hassle-Free Boiler Installation

Get your new boiler installed today and save money on your heating bills with an new energy efficient boiler.

Get a New Boiler

Conclusion

After reading the above blog, I hope you know what an F75 error code on your boiler means, its reasons, and possible preventive measures. Also, you know that to solve the problem, you must contact a certified gas-safe engineer, as the problem is related to internal components that should be left for a certified professional to deal with. If you are looking for assistance from an accredited engineer, contact us at 0345 3192 247, and one of our representatives will guide you on call, if necessary; he will then book your appointment with a gas-safe registered engineer.