Newer Vaillant ecotec boilers don’t have a traditional pressure gauge. They have a digital gauge shown on left side of the display.

How can I check the pressure on my Vaillant boiler?

You can see a more accurate pressure by pressing the top right button on the front of your boiler controls.

Why do I need to know the pressure?

You need to know the pressure as this warns you of leaks and other faults related to your central heating system.

Most (not all) boiler will switch off and display a fault code if the pressure gets too low. Regularly checking your pressure can avoid losing your heating or hot water avoiding costly breakdowns and repairs.

How do I check the pressure?

Most boilers have a small pressure gauge to see the pressure. Modern vaillant boilers don’t have a pressure gauge visible. You need to go through the menu to find the pressure.

Check it when it is cold

It’s perfectly normal for the boiler pressure to go up to 2.5 bar when it is hot. If the pressure is too high when you check it turn the heating off and allow the radiators to cool to room temperature then check again.

Use the top right button.

The first press brings the display to life.

The second press shows the temperature the heating is set at.

The third press displays the pressure in bar.

When the boiler is cold the pressure should be between 1 and 1.5 bar.

What do I do if the pressure is too low?

If it’s too low you may have to use your filling loop to increase the pressure.

Click here to see our easy guide to using a filling loop.

What do I do if the pressure is too high?

First thing to do is allow the radiator to cool. If it’s still too high when the radiators are cool you will need to drain some water from the system.

Click here to see our easy guide to dropping the system pressure.