emergency plumber Bristol & Bath boiler system

How to remove a airlock from a open vented heating system

Emergency Plumber 24|7 Ltd

How to remove an airlock from an open vented heating system

I have an airlock in my heating system? here’s what you can do

Tool list
  • Hosepipe
  • Pair of grips
  • Adjustable Spanner
  • Bleed Key
  • Small flat head screwdriver
  • PTFE tape

Please make sure all electric supply to the heating and hot water system is turned off.

Isolate any water entering the f&e tank, this is the small black tank usually situated in your loft space. Some people gently tie the ball valve up to a rafter with a bit of string to stop the water from the ball valve, if you feel competent to do so then this is an easy way. However, I would always make sure that you know where to turn off your water supply in case of a plumbing emergency.

  • Once you have completed the above its time to look for a drain off on your heating system this can usually be found on a downstairs radiator on the pipework below (brass valve)
  • Fit your hose pipe to the drain off valve tightly and now slowly open anti-clockwise, I would advise you NOT to completely open this as they will be a lot of water in your heating system. Just open enough to allow water to discharge out of the hose pipe and check radiator valves are fully open on both sides
  • Has the water discharged reduced from the hose pipe? If so slowly open the drain off valve some more to allow some more water to flow out of the pipe
  • Now head up to the highest radiator in the house and slowly open the bleed valve situated on the left or right-hand side of the radiator. You must open all bleed valves slowly (do not open fully) just slack till you can hear the air coming out of the radiator. (Be careful not to lose the screw)
  • Check to see what colour┬áthe water is in your heating system. Is it dirty? can you see black sludge? debris? or even rusty water?. This could mean your heating system may need a power flush click link below for more information on Power Flushing

Power Flushing Central Heating Systems

Once all air and water has been removed its now time to re-fill the heating system

  • Close the drain off
  • Close all bleed valves on all radiators
  • Head up to the loft and clean out the feed & expansion tank (scrap all debris from the small tank) re-fill
  • Open the water supply to allow the water to start filling the f&e tank
  • Head down to the lowest radiator on the system and open the bleed valve, allowing the air to escape to allow it to be replaced with the water from the tank ensure you have a rag or tissue to wipe once that radiator has been refilled with water
  • Repeat this to all downstairs radiator first then work your way to the highest point
  • Walk around the house and check for any leaks or faults on the heating system

Switch boiler on and wait ­čśŐ

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