Radiators (Guide To Air Removal)

If you intend to try and remove air from a radiator, you will need to identify the valve to use for the process. The valve is normally fitted at one of the top corners on most radiators, looking like a square nut that set in a recess. To do this you need to have a bleed key to hand, which is small and has the correct size and shape of recess to fit the square spindle. Professional services like London Worcester Boiler Repair carry all types of bleed keys. These keys can be bought from all plumbing merchants.

What To Do:
Isolate the boiler and pump. With the key, turn the block anticlockwise for about one quarter of a turn. This should suffice and allow the air to escape. However, have a container ready for any spillage in case. As the air begins to escape you will hear a hissing sound, so ensure the bleed key stays in place on the block so when the air stops and a dribble of water appears you will be able to shut the valve. A London Worcester Boiler Service engineer can carry out this task if you are not confident or unsure and will also guarantee the work.

No Joy:
If you have no joy with this process, then you check if feed and expansion tank in your loft is holding any water. If it is still full, the valve may have a blockage. Close down the radiator with both, inlet and outlet valves on the bottom corners of the radiator. Now, remove the screw from the middle of the bleed valve. Use a thin piece of wire and clear it. When the valve is clear, open up a radiator valve slightly and release some water from the hole. Shut the valve and refit the bleed valve screw. Now open both radiator valves once more and test for leaks and smooth operation.