Possible air lock?

Joined
10 Feb 2005
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Hello all,
I've got a vented central heating system with a Baxi Solo boiler.
It's been working well until I noticed that my upstairs radiators were cold at the top and hot at the bottom, so I bled them. Not much water came out though, and there was a lot of bubbling in the pipes, then the pump squeeled, lots of banging etc. Then the vent on the radiator stopped hissing so I closed the valve, not much water came out.
This was done with the pump on, (sorry), I think I've sucked in more air and made the situation worse.
Now I have no heat or hot water, think this is due th the fact that there is a lot of air in the syetem.
The boiler lights, but with the air in the system it quickly overheats and the thermal cut-out operates. For the few mins that the boiler is on, the system sounds as though it is trying to expelling air.
Basically, my central heating needs to fart, but can't!
 
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Header tank is OK, has water in and refill valve working fine!
Thanks
 
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Thanks....
Think I've come to the limit of my knowledge!
Didn't take long! :D
There's a motorised valve under the pump, this has 2 positions:
Auto and Man. It's normally set to Auto and operated when the cental heating is on.
Also, how do I bleed the pump?
Sorry for being thick!
 
Did that, not much water came out. Should I do it with the pump running?
How long should I wait?
(I did it with it running....)
Cheers.
 
Having problems bleeding the system.
The downstairs radiators are OK, but the upstairs ones don't seem to want to bleed. There's water in the bottom of the radiators, but none comes out of the bleed valve. There's hissing for a few seconds, then nothing...... :cry:
 

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