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 Make sure that the CH (Central Heating) is in the off position

• Place your bleed key on the bleed nipple (this will be at the top, at one side only and could even be at the back, but usually is at one end)
• Turn the bleed key 1/2 a turn anti clockwise to open (you should here the air hissing)
• When water starts to dribble out turn the key 1/2 a turn clockwise to shut it off (Do Not Over Tighten)

If you have a sealed system the pressure will probably need topping up to 1 bar (If there isn't a gauge on or near the boiler this instruction will not apply)

Faulty Radiators

If a central heating system has been:

• fitted correctly,
• flushed out,
• Inhibitor added at the time of installation, and
• topped up (if the system has been drained down)

The radiators should not prove faulty. A radiator has no working parts, but it is made of steel and so can be damaged (rusted) by the corrosive effects of untreated water within it.

If you have damage to the radiators, then often the first sign is when a radiator leaks. Cold spots or constantly having to bleed the radiators. If you’ve bled the radiators and the water is black then you have a slight problem, but if the water is brown or orange then you have a major problem. This needs sorting out properly before you get to the stage where a different radiator starts leaking every few months

The Main Causes of Radiator problems are:

• TRV sticking, this is usually when left at the off position all summer
• The system’s cold feed and expansion are not configured correctly (Open systems only)
• The system had not been properly flushed out when new
• No corrosion inhibitor has been added to system

Solutions

• Leave all TRV's on Max all summer and turn the heating off at the clock
• Firstly, make sure that the system has been installed correctly, or correct if necessary
• Secondly, add a cleaning agent to the system
• Thirdly, flush out the system several times with clean water
• Finally add a good quality system inhibitor
• Or you can have the system “Power Flushed” which is the same as above, except a powerful pump is used to force in the clean water and flush out the sludge build up.