How to bleed your radiator

• Radiator key (or flat-head screwdriver/Allen key if it fits)
• Towel or rag
• Jug or container

Step-by-step guide:

1. Turn off heating: Switch off your central heating and let radiators cool down to avoid burns.
2. Locate valve: Find the small bleed valve at the top of the radiator, usually on one side.
3. Prepare for drips: Place a towel and jug underneath the valve to catch water.
4. Insert key & turn: Put the key/screwdriver in the valve and turn it slowly anti-clockwise (about a quarter turn).
5. Listen for air: You’ll hear a hissing sound as trapped air escapes.
6. Close valve: When the hissing stops and a steady trickle of water appears, turn the key clockwise to tighten the valve. Don’t overtighten.
7. Repeat: Do this for all radiators, starting with the one furthest from the boiler.
8. Check boiler pressure: After bleeding, your boiler pressure may have dropped; check the gauge (usually 1-2 bar) and repressurise if needed.
9. Turn heating on: Turn the heating back on and check your radiators are fully hot.

The following video gives a demonstration from Which?

If you still need some help, please contact Liberty on 0330 123 9622