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The pump & impellor shaft are at 90 degs to the inlet / outlet pipes, the impellor is on the end of the pump.

After draining the central heating system about 7 weeks ago the central heating pump is now noisy due to air in the system, info to help diagnosis as follows - All radiators are working upstairs and down Bled the radiators regularly but only a small amount of air released. Bled the pump but...

Thanks, never new that, but of course it is as tight as hell, with only about 4" of space upto the water cylinder, will keep bleeding radiators as system is settling down.

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

radiators are hot now but still some air in the system as the pump is very noisy at times, no air from the bleed screw near the pump, will the air gradually go or is there something else i can try

Left the heating system running and slowly they are now all working, thanks

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...