Best way of Bleeding Central Heating System

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I just had to empty my heating system as one of the screw in the flooring boards had gone through one of the pipes and I wasn't sure whether if it was the water pipe or the central heating system pipe.

I have now refilled the system by means of releasing the pressure valve in the system; I don't have a small tank in the loft any more since installing the mega flo system.

When I switch on the heating, the radiators are not getting hot. Presumably, there is air in the system.

When I open the radiator in our bedroom, there is no sign of any air in the system. Clean water just comes out.

What is the best way of bleeding the system. Should I try to bleed every radiator? Where should I start from - upstairs or downstairs. Should the heating be on when I bleed? Does one have to bleed the pump as well?
I don't know how to bleed the pump. It is a Grundfos pump. Is it easy to bleed a pump or should I seek expert help.

Any help will be appreciated.
 
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Everything turned off, motorized valves open in the manual position, and vent everything in sight, as well as the radiators.
 
...I have now refilled the system by means of releasing the pressure valve in the system...
:confused:

What do you mean by that? Opening a release valve does not fill the system.

When I open the radiator in our bedroom, there is no sign of any air in the system. Clean water just comes out.

Should I try to bleed every radiator? Where should I start from - upstairs or downstairs.
Bleed all rads, starting downstairs.

Should the heating be on when I bleed?

No
 
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bengasman";p="1332412 said:
...I have now refilled the system by means of releasing the pressure valve in the system...
:confused:

What do you mean by that? Opening a release valve does not fill the system.

What I meant was there is a kind of a stop cock on one of the pipes in the airing cupboard on which a pressure gauge is fixed so that I know when to stop filling the system - usually about 1.5 to 2 bars.
 

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