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How to Re-Pressurise Boiler

Step-by-Step Guide How to Re-pressurise Boiler

Follow this step-by-step guide on how to re-pressurise boiler

Bleeding a radiator involves releasing trapped air inside the radiator. Doing this helps improve the efficiency of your heating system. This guide will take you through safely bleeding your radiators and how to re-pressurise your boiler. If you have any concerns, please consult a professional.

Step-by-step how to re-pressurise boiler

Keyless Filling Link

  • If the appliance pressure gauge needle falls below 1 bar, recharge the system.
  • Pull the blue lever down to begin filling.
  • Keep an eye on the pressure gauge.
  • Once the needle reaches between 1 and 1.5 bar, release the blue lever to stop filling.

    • Keyless filling link

    Integral keyed filling link

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

  • Firmly insert the filling key into the body of the filling link, making sure the arrow on the key shaft aligns with the open padlock symbol.
  • Turn the filling key to the right until it stops, ensuring it locks in place and cannot turn further. The arrow should now point to the closed padlock symbol, bridging the two sections of the filling loop.
  • Turn the white knob to the left to allow water to fill the system.
  • When the pressure on the appliance facia pressure gauge reaches between 1 and 1.5 bar (zone A), turn the white knob to the right to close the valve. Avoid overtightening.
  • Turn the filling key to the left until it stops, aligning the arrow with the open padlock symbol, then pull the key straight down to remove it. Remember to store the key in the bottom panel.

    • Integral keyed filling link

    Is your boiler pressure consistently dropping day after day?

    If your boiler keeps losing pressure and you find yourself topping it up regularly, this shouldn’t be happening. Before searching for leaks in your system, there’s an important step: check your pressure gauge while your heating is running.

  • Does your pressure gauge spike to a high level before your heating begins to cool down?
  • Do you notice any copper pipes on exterior walls leaking or spraying hot water?

    • If you notice one or more of these symptoms, it could mean that the expansion vessel inside your boiler needs recharging or replacing. This work must be performed by a Gas Safe registered engineer, this fault is common across all boiler brands. Servicing your boiler should include checking and recharging the expansion vessel, so this issue can often be resolved through regular boiler maintenance.

    Get your boiler serviced by PDF Gas & Heating. Contact our friendly team today.

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