If the pressure gauge on your boiler is reading below 1 bar, you'll need to repressurize the system. Repressurizing is a straightforward process:1. Turn off your boiler and allow it to cool.2. Locate the filling loop. This is usually a flexible braided hose connected to your mains water supply and boiler, under the unit. Sometimes, the loop is built in; other times, it is external. 3. Open both valves on the filling loop slowly, usually counterclockwise. . Listen for the sound of filling.4. Keep an eye on the pressure gauge. When the pressure reaches the recommended level (usually between 1 and 1.5 bar), close both valves on the filling loop turning clockwise.5. Turn your boiler back on. Confirm that pressure is at an appropriate level. If problems persist, contact a qualified HVAC technician. If you're not sure how to repressurize your boiler, it's best to consult a professional. Incorrectly repressurizing the system can cause damage.