Radiators downstairs cold

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Plumber came today to change pump on my system as the old one had leaked and popped the fuse.
The new one is in and whirring away like it should do.

Sine he has been, however, only a few of the upstairs rads get hot, 2 or 3 of the rest of upstairs and all of the downstarirs rads are cold.

I've done the obvious things like bleeding the rads and have shut off the upstairs ones it the hope that the hot water might like to go downstairs.

Grateful for suggestions....

Thank you

TTC
 
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Can you change pump speed, small switch on side numbered thus, I, II,III.
 
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airlock by any chance?
try the old trick of closing all but one, run it until hot, bleed again if need be, turn off, and next one.
many posts on this problem, lots of sugestions to be found
 
Putting the pump on III did the trick. I'll balance the system and bleed them all (again) once its run for a while.

The plumber couldnt test it before he left as needed fuse for the control board - Potterton Suprima :(
The fuse had fried due to pump leaking water into it electric guts.

Thanks for your advice chaps.

TTC
 

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