Help! What does my Vaillant boiler error code mean?

Boilers can be tricky things to work out, and error codes can send even the calmest people into a slight panic! Our handy guide to all Vaillant Error codes should put you at ease and tell you all you need to know if you experience a boiler error code, including what you can do about it.

Valliant Boiler Error Codes Guide

Valliant Boiler Error Code F62

Issues with gas valves are usually the culprits behind seeing the Vaillant F62 error code. A gas leak is dangerous, so when your Vaillant boiler detects gas escaping from a faulty gas valve it will lockout for your safety and display the F62 error code. It is important that you do not attempt to fix the Vaillant ecoTEC F62 error code yourself. Instead, a gas safe engineer should be contacted. Click here to contact us to help.

Valliant Boiler Error Code F28

Seen on the Vaillant ecoTEC Pro, ecoTEC Pro Plus and Turbomax Plus 824/828E boilers, an error code of F28 means that the boiler has failed to ignite. Causes of this can include;

  • No gas supply to your property
  • Defective spark electrodes
  • Frozen condensate pipe

To resolve the F28 error code, you will need to hire a Gas Safe Engineer who will be able to diagnose exactly what is causing the problem and fix the boiler. Click here to contact us to help.

Valliant Boiler Error Code F22

The Vaillant F22 error code = low water pressure. Also displayed as F.22, the water pressure in the boiler needs to be increased again to work. Your Vaillant boiler will only work when the water pressure is around the 1.5 mark on the gauge.

You could attempt to fix this yourself provided you know what you’re doing, but if you wanted to take the hassle out of it, a Gas Safe Engineer would be able to do this quickly.

To increase the boiler pressure, first switch the boiler off and let it cool down. Next, find the filling loop (most likely to be under the boiler, and is a metal hose with a valve at each end). Turn the valves to allow water to enter the boiler, and keep an eye on the pressure gauge as you do so. Turn the valves back to their starting point once the pressure gauge displays 1.5.

Boilers gradually lose pressure over time, if you notice a sudden drop in pressure there could be a leak and it is important to flag this with a Gas Safe engineer. You should not attempt to repair this by yourself. Click here to contact us to help.

Valliant Boiler Error Code F29

An F29 error code on Vaillant ecoTEC boilers is one of the most common fault codes to appear. It can be caused by a number of reasons, namely;

  • Low gas pressure
  • Debris in the burner
  • Frozen condensate pipe
  • Faulty flue
  • Issue with ignition lead or electrode

With so many reasons that could be behind why you’re seeing the Error Code F29, the best way to identify the problem and fix it is by hiring a Gas Safe engineer. Luckily, you’re in the right place. Click here to contact us to help.

Valliant Boiler Error Code F75

The F75 error code is another fairly common code that pops up on Vaillant ecoTEC boilers. It normally indicates that there is a fault with the pump or the pressure sensor. It is best to check with a gas safe engineer what the problem is.

​​When dealing with any kind of boiler, for any error code – if you smell gas immediately turn off the gas supply and contact a Gas Safe registered engineer.

If you’re seeing one of these error codes and it is one that can’t be safely solved yourself, we’re here to help as your local experts in everything boilers, plumbing and heating. Click here to contact us to help.