You’ll need a radiator bleed key (usually with a square indent to fit the valve on the radiator) and an old tea towel or rag. Fit the key to the valve at the top of the radiator and loosen. If air is trapped inside, you’ll start to hear a hissing sound as the air escapes. Make sure you hold the rag around (and especially underneath) the valve entrance to catch any drops of water which also escape.
Once a regular stream of water starts to escape, use the key to close the valve to the radiator as it is now free of air.
Now you need to go back to your boiler and check that the system is still showing enough pressure in the system for the boiler to operate. If you have a pressure dial, there will be a green zone – if the needle is sitting within it, you should be OK. If you have a digital display that can be accessed through the boiler’s control panel, it will give a reading that you can check against the boiler manufacturer’s instructions. If the pressure has dropped slightly, you can top it up using the filling loop. If you are unsure about this step, call Staunch and Flow today.