1) Turn off the central heating
Before bleeding a radiator, you should ensure that the central heating is switched off at the mains to make sure that no more air is let into the system and trapped there.
2) Find the bleed key
The small bleed key (or radiator key) should have come with your radiator but if you can’t find it, don’t worry too much, you should be able to find and buy yourself a new one from your local DIY store.
3) Find the bleed valve
The bleed valve is normally located on either side of the radiator, usually near the top.
4) Protect the area
Put a small cloth or towel around the bleed valve area to catch any leaks that may occur. You should also wrap your had in a towel or cloth to protect it, as the air that comes out may be hot.
5) Bleed the radiator
Insert the lees key into the bleed valve and turn it anti-clockwise, slowly and carefully, normal a quarter turn will be sufficient. Any air that is trapped in your radiator will begin to be released, accompanied by a hissing sound. When water begins to trickle out it means that the job is done!
6) Tighten the bleed valve
Once the water has begun to come out, you should tighten the valve back to it’s original position. Give it a wipe over to clear up any spills, just be careful as the water can be very hot.
7) Turn the heating back on
Don’t forget to turn your central heating system back on once you’ve finished bleeding your radiator(s). Leave it a couple of hours and check back on them to see how they are doing and that they are warm over the whole surface. Job done!
If ever you are in doubt with a DIY related problem, it is best to call in a professional engineer to fix the problem, or you may end up making it worse!
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