Vailliant Boiler – F75 Boiler Fault & How Do You Fix It?

In this article we are going to discuss the F75 boiler fault, which relates to Vailliant Eco Tec Combi Boilers & is different from the Vailliant F22 Boiler Fault. & the Baxi E119 Fault code we have also advised on.

When it comes to essentials in the home, it is a safe bet that the boiler ranks pretty high. Without this vital element, you can lose hot water and / or central heating – neither of which are ideal when the temperature starts to drop. Identifying the error codes correctly can offer useful insight into the problem, and this is the first step to a fix.

Boiler Pressure GuageAn F75 error code means that there is no pressure change being detected when the pump starts. In short, the boiler is failing to detect the pressure it should whenever the pump is up and running, and the water is flowing through the system. This is usually due to a problem with the pressure sensor, the pump or a leak on your heating pipework causing your boiler to lose pressure.

The sensor may become clogged and blocked with dirt, sludge or debris, meaning it is unable to read or respond to the changes in pressure. Additionally, an incorrect installation can result in carbon building up in the filter system.

A leak on your heating system pipework could be caused by hidden or buried pipework deteriorating with age.

Can I Fix An F75 Code Myself?

One of the main issues with an F75 code is the range of issues it can highlight. This error message can point to a wide number of issues, and so you will need to attempt any fix or repair by a slow, methodical process.

The first issue to consider is whether the issue at hand is as a result of the pump, or points to a fault with the pressure sensor. Start by resetting the boiler using the lockout button, and then turn on heating, or run a hot tap to start demanding heat from the system.

One of the easiest ways to distinguish the source of the issue is simply to listen closely to the boiler when it is turned on and attempt to kick into life. If the pump is working correctly, you will be able to hear a low rumbling sound running on repeat for a few seconds at a time, every twenty or so seconds. If you can hear this, the pressure sensor is most likely the issue; no rumble on the other hand, means that the pump is the problem.

If the pressure sensor is the problem, it is fairly easy to rectify, but will require a new part – we would always advise stripping, cleaning and investing in a new replacement rather than an attempt to repair. While it is possible to clean out and repair the unit, this is only likely to lead to a failure sooner rather than later. Pressure sensors are fairly cheap, and so it is always a good idea to start from scratch, rather than attempt a repair which may go wrong, and end up costing you more money.

What Are My Options When My Vailliant Eco-Tec Boiler Is Losing Pressure?

If you are trained and educated in engineering, heating and boilers, there is a chance that you will be able to repair or replace the faulty parts yourself, restoring your boiler to its former glory. In most cases however, this is a job which is best left to the professionals. A F75 error can be tricky to diagnose and fix, and any repair is a job best left to a local plumbing and heating engineer who will have the tools, equipment and skills to tackle the job correctly.

Is Your F75 Error Caused By A Leak On Your Heating System?

Here at ADI Leak Detection, our team are the guys you need when there is a hidden water leak on your heating system.

We use a wide range of specialist leak detection equipment and years of expertise to pinpoint the exact location of your leak, potentially saving endless damage to your home and minimizing the cost of rectifying the leak. The best bit is in most cases our trace and access fee is covered by your home or building insurance.

Learn more about our specialist services by watching this short video:

Call ADI Leak Detection on 0800 731 3843 If You Suspect Your Boiler Losing pressure (F75 Error) Is Caused By A Leak On Your Central Heating System

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