I have a Vokera Mynute boiler and a TP9 controller which has been replaced with a new TP9 controller (old one wouldn't have dhw and ch on at the same time) since the new TP9 has gone in, we can't get any heat from our 4 upstairs rads,I've bled them all, no seeping air just clod clear water from them all , downstairs rads working perfectly well , i'm at a loss , any advice appreciated. 
