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Easy Instructions To Re-Pressurise Your Boiler

How to Re-pressurise your Boiler: Step-by-Step

Trapped air in your radiators can prevent them from heating up properly. Bleeding them helps release this air and boosts your heating system’s efficiency. This guide will take you step-by-step through how to bleed your radiators safely, and how to re-pressurise your boiler if needed. If you’re unsure at any point, don’t hesitate to reach out to a qualified professional.

Re-pressurise your boiler

Keyless Filling Link

  • If the pressure gauge shows less than 1 bar, it’s time to top up the system.
  • Gently pull the blue lever down to begin filling.
  • Keep an eye on the pressure gauge as it rises.
  • Once the needle reaches between 1 and 1.5 bar, let go of the blue lever to stop filling.

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    Keyless filling link

    Integral keyed filling link

    Locate the filling key and follow these steps to re-pressurise your system:

  • Push the filling key firmly into the filling link, making sure the arrow on the key shaft lines up with the open padlock symbol.
  • Turn the key to the right until it stops. It should now be locked in place and unable to turn further. The arrow should now point to the closed padlock symbol—this means the two parts of the filling loop are connected.
  • Next, turn the white knob to the left to let water into the system.
  • Watch the pressure gauge on the front of the boiler. When the needle reaches between 1 and 1.5 bar (zone A), turn the white knob to the right to close the valve. Don’t overtighten.
  • Finally, turn the filling key to the left until it stops (arrow lined up with the open padlock symbol), then pull the key straight down to remove it. Be sure to store the key in the bottom panel for future use.

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    Integral keyed filling link

    Does your boiler lose pressure daily?

    If your boiler keeps losing pressure and you find yourself topping it up regularly, that’s a sign something isn’t quite right. Before you start checking for leaks in your system, there’s one important thing you should do—take a look at the pressure gauge while your heating is on.

  • Does the pressure gauge climb to a high level before the heating begins to cool down?
  • Can you see a copper pipe outside (usually near the boiler) dripping or spraying hot water?

    • If you notice one or more of these signs, it could mean the expansion vessel inside your boiler needs to be recharged—or possibly replaced. This must be carried out by a Gas Safe registered engineer, this fault is very common across all boilers brands. Boiler servicing should include to check and recharge your expansion vessel, so this fault could be repaired by getting your boiler serviced.

    Get your boiler serviced by Matt Grange Home Heating Experts, Get in touch with our friendly team.

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