This relates to customers with gas-fired back boilers and solid fuel boilers.
Before bleeding a radiator:
- If the whole radiator is cold, check that the radiator control and lock shields are open. If more than one radiator is cold, the whole system needs to be checked by a plumber
- Turn off the heating system before bleeding
- You need a special radiator key available from DIY stores. You will also need an old rag or cloth and a bowl.
How to start
- The bleed valve is a small square nut at the top end of the radiator
- Place the key over the valve and hold a cloth around it to soak up any water
- Gently turn the key anti clockwise until you hear a hiss – this is the air being released
- DO NOT unscrew the valve completely
- When water starts to come through, turn the key back clockwise to shut the valve off.
- Once the radiator has been bled, check the pressure gauge on your boiler. If the pressure is low you will need to re-pressurise the boiler.