topping up a boiler

Find out how to top up the pressure in your boiler.

If your heating is not working, you may need to top up the pressure in your boiler. This video will walk you through some quick and simple steps on how to do this.

Always check your user guide to make sure the error code displayed on your boiler is for low pressure, before topping it up.

For this repair you will need:

  • Your boiler user guide

You can also follow along with the steps below.

Find the two valve taps underneath your boiler. Open the top valve first turning it from a vertical to a horizonal position.

Now open the other valve slowly, turning it from a vertical to a horizonal position. You will hear the water pressure going into your boiler.

Keep checking on the display as pressure is added to the boiler. When you get to the required pressure stop by turning both taps back to the original vertical position.

The ideal pressure is between 1 and 1.5 bar.

top tip

Remember to check your boiler pressure regularly, especially, if you’ve just topped up any radiators in your home.