Air lock in central heating system

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6 Nov 2010
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Derbyshire
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United Kingdom
Can anybody give advice, i drained the central heating system today and fitted 1 TRV downstairs and 4 TRV's upstairs, filled up the system, added inhibitor, bled the radiators and now the upstairs radiators are hot but downstairs are cold, there is air circulating around when the pump is running in the airing cupboard, there is hot water at the bleed off point under the downstairs floor.

Any ideas how to get rid if the air
 
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Turn off hot rads, bleed pump and adjust speed on pump up and down as this 'moves' stuck/trapped air. Don't forget to put the pump on the speed you found it on.

Andy
 
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Put your hand on the top of the rads to see if one is cooler - then bleed it off. Otherwise wait until it cools and go round them all again.
 
can take a few days to settle down.
now the systems been running with no airlock problems the odd bit of air should find its way out the vent pipe or to the rads as said above.
you say no air out of the air vent near the pump. have you tried rebleeding the actual pump ?
 
can take a few days to settle down.
now the systems been running with no airlock problems the odd bit of air should find its way out the vent pipe or to the rads as said above.
you say no air out of the air vent near the pump. have you tried rebleeding the actual pump ?

cant find a bleed screw on the actual pump, will keep bleeding the radiators, as a little bit of air comes out still, thanks
 
the bleed screw on a pump is the big screw in the middle.

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