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Vaillant F28 Error / Fault Code Explained & How to Fix

The Vaillant boiler F28 error code means that the unit has failed to ignite, leaving your home without central heating and hot water.

F28 is a fault seen on Vaillant ecoTEC Pro, ecoTEC Pro Plus and Turbomax Plus 824/828E boilers and is defined by Vaillant in the following way:

Vaillant Fault Code Possible Cause Meaning
F28 No ignition / ignition problem Either insufficient gas in the system or an issue with either the electrode, ignition lead or electronic ignitor.

To put it simply, the flame that water passes over to warm up before either circulating around the central heating system or to the taps, isn't lighting. This is essential for your home to have central heating and hot water.

There are many possible causes of the F28 error code and should be diagnosed and resolved by a Gas Safe engineer.

To get your Vaillant boiler working quickly and safely hire a Gas Safe engineer. Use Boiler Guide and you'll be contacted by up to 3 local engineers who will each provide a free repair quote for fixing the fault that's preventing your Vaillant boiler from igniting.


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What causes the Vaillant F28 fault?

A Vaillant boiler could fail to ignite and display the F28 error message when any of the following happen:

No gas supply

Vaillant F28
A common cause of the Vaillant F28 error is quite simply that there isn't any gas being supplied to your property. This could be down to something as minor as the gas meter being turned off or out of credit to an issue with your gas supplier.

It's a good idea to test any other gas appliances around your home, such as a gas hob, to see if they're able to light. If your other gas appliances are working then you know there's a fault specifically with your boiler.

Defective spark electrodes

Alternatively, there could be a supply of gas to the boiler but the fault lies with generating the spark to light the flame. These can wear out over time so could need replacing. You should contact a Gas Safe engineer if you suspect this to be the case, as this isn't something to fix unless you're a fully-qualified professional.

Frozen condensate pipe

A condensate pipe is found on all condensing boilers and is there to send waste gases outside and down a drain. As they're outside, they can often freeze during the winter when the temperature drops and cause the boiler to stop working.

Thawing out a frozen condensate pipe is another boiler issue that you can take to resolving yourself. To help you, we've put together a guide to defrosting a frozen condensate pipe but if you're not confident doing it yourself, contact a qualified heating engineer who will be able to safely and professionally get your boiler working again.

For anything else, you should always hire a Gas Safe engineer, never attempt to fix a boiler yourself.

Fix the Vaillant F28 error code

The safest way to fix your Vaillant boiler and resolve the F28 error code is to hire a Gas Safe engineer.

At Boiler Guide, we have a network of trustworthy and fully-qualified heating engineers right across the UK who will be able to safely and professionally get your Vaillant boiler working again. Simply complete our online form so that we know the type of work you're looking for and we'll match those requirements with trusted professionals in your local area.

After completing the form, you'll be contacted by up to 3 Gas Safe engineers who will each provide a free quote for you to then compare. Receiving multiple quotes will help to give you the peace of mind that you're getting the best possible deal.


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Boiler Guide Team

About the author

Boiler Guide Team

Boiler Guide has been home to a host of heating experts who have helped millions of UK homeowners searching for advice and guidance. If you’ve got heating questions, we’ll have the answers.

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