I think I must have an air lock in my central heating system, it consists of a wall mounted boiler, cold water tank and header tank in the loft, the water pump is in the airing cupboard next to the hot water tank, the pump straed making a noise and the radiators were only getting warm at the bottom, I tried to bleed them without any luck so i removed the pump which is only 2 years old, it was completley dry inside. Any idea's how to remove the air lock?
Zetor
Check the small fill/expansion tank in the attic. Make sure that the ball valve is working. It may have stuck, and all the water evaporated and not been replaced. If there is a tap or gate valve in the feed pipe from the fill-expansion tank to the system, make sure that it is turned on!
If the pump has not been written off by being run dry.... To get the air out of the [new 8-(] pump undo the chromed disc or black plastic knob on the end of the pump motor body which should let out air and a few dribbles of water.
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