How To Restore Pressure In A BoilerPosted on 12 May 2025 | Follow this guide to learn how to restore pressure in a boilerBleeding a radiator involves releasing any trapped air within it. By bleeding your radiators, you can enhance the efficiency of your heating system. This guide is created to help you safely bleed your radiators and restore pressure in your boiler. If you have any worries, please get in touch. Keyless Filling LinkIf the pressure gauge on the appliance shows less than 1 bar, top up the system.Lower the blue lever to begin filling.Keep an eye on the pressure gauge during the process.Once the needle reaches between 1 and 1.5 bar, lift the blue lever to stop filling.Integral keyed filling linkFind the filling key and follow the steps provided to re-pressurise the system.Insert the filling key firmly into the filling link, making sure the arrow on the key aligns with the open padlock symbol.Turn the key clockwise until it stops. The arrow should now point to the closed padlock symbol, indicating the key is locked in place and the filling loop is connected.Turn the white knob counterclockwise to begin filling the system with water.Once the pressure gauge on the appliance fascia reaches between 1 and 1.5 bar (zone A), turn the white knob clockwise to close the valve. Avoid overtightening.Turn the filling key counter clockwise until it stops, so the arrow points to the open padlock symbol, then pull the key straight down to remove it. Be sure to store the key in the bottom panel.Is your boiler losing pressure every day?If your boiler is constantly losing pressure and you find yourself frequently topping it up, this indicates a problem—it’s not normal operation. Before you start checking for leaks in your system, there’s one important thing you should do: check the pressure gauge while the heating is on.Does the pressure gauge rise to a high level before the heating switches off or begins to cool down?Is there a copper pipe on the outside wall that’s dripping or spraying hot water?These signs could point to an issue with the pressure relief valve or expansion vessel. Further investigation may be needed.If you notice one or more of these symptoms, the expansion vessel inside your boiler may need to be recharged or replaced. This task must be carried out by a Gas Safe registered engineer, this is a common issue across all boiler brands. During routine boiler servicing, the expansion vessel should be checked and recharged if necessary. In many cases, simply booking a service can resolve this fault.Hopefully this guide on how to restore pressure in a boiler helps you. If your still having issues, get your boiler serviced by Hynes Plumbing & Heating, Get in touch with our friendly team.Post Navigation← Previous PostNext Post →
