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The Vaillant F28 Fault Code - Error Code Explained & How to fix (Updated 2021)

When you see the F28 Fault on your Vaillant boiler its means the boiler has failed to ignite. No gas supply.

F28 Fault is seen on the more expensive Vaillant boilers such as the ecoTEC Pro and the ecoTEC Pro Plus which are commonly fitted to council houses in Northampton which were installed around 2016.

Vaillant Fault Meaning Possible Causes
F28 F.28 Failed to ignite Boiler won't ignite/failed: No gas or insufficient gas, igition lead (Ran out of credit on the gas - Pay as you go), condensate pipe

When there isn't any gas supply to your boiler it means that a flame cannot heat the water that heats your home and hot water. This is essential for your home to have hot water and to heat your radiators.

The F28 fault should be diagnosed and resolved by our boiler engineer.

How to fix the Vaillant F28 fault

To get your Vaillant boiler working quickly and safely we strongly recommend that the F28 fault be fixed by our knowledgeable boiler engineer. If you find out that you have ran out of gas because your gas credit has ran out, simply top up and reset your boiler.

Contact our boiler engineer by chatting on WhatsApp or you can request a quote.

The causes of the Vaillant F28 fault

There are many possible causes of the F28 error code, below are the causes.

No gas supply
The most common cause of no gas supply and the F28 fault is your credit has ran out if you pay for your gas by credit. Another cause of an F28 fault is an issue with your gas supplier. Also check your gas meter to make sure it wasn't turned off by a accident.

vaillant f28 fault display
vaillant spark f28 fault cause

Failed Vaillant spark electrodes
Another F28 fault could lie with the electrodes, if your boiler doesn't get serviced every year, the electroade in your Vaillant boiler could be defective and fail generating the spark to light the flame. You can fix this yourself if you're a fully-qualified gas engineer/boiler engineer.

Frozen Vaillant condensate pipe
Condensate pipes are found on all condensing boilers and is there to send waste gases outside via a plastic pipe. They can often freeze during the winter causing problems when the temperature drops and the boiler to stops working.

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