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I do not know how handy you are, but you may be able to try.
Topping up the pressure
Turning off all rads.
On the last on circuit (One that not working) turn off both lock shield and hand wheel valves and remove 1/2" BSP plug or air valve at top of rad. Screw some thing 1/2" Bsp that you can connect a short length of hose to. Once the hose end is in a bucket turn on one of the rad valves, this should pull a lot of water and air through. ( you will see it, in terms of a splutter.) Turn off valve and try the other, same deal as above.
Put the plug back and turn rads on again.
(once a system has been drained and filled there will be pockets of air all over the system. Which will rise to the third floor, which means you may need to repeat.
Good Luck
Topping up the pressure
Turning off all rads.
On the last on circuit (One that not working) turn off both lock shield and hand wheel valves and remove 1/2" BSP plug or air valve at top of rad. Screw some thing 1/2" Bsp that you can connect a short length of hose to. Once the hose end is in a bucket turn on one of the rad valves, this should pull a lot of water and air through. ( you will see it, in terms of a splutter.) Turn off valve and try the other, same deal as above.
Put the plug back and turn rads on again.
(once a system has been drained and filled there will be pockets of air all over the system. Which will rise to the third floor, which means you may need to repeat.
Good Luck