boiler flow issues

Hello All,

I am putting a new bathroom in. At the moment I am taking tiles off the wall so had to take the radiator off. I am fitting a new radiator when the tiling is finished.
My problem is, I went to switch the heating on today and the boiler has a flow issue, the flow temp rockets up to 90c. I don't understand why this is because the radiator I took off had a bypass between the flow and return pipes that went to the radiator so surely I still should have flow around the system??

Please help

 

I've put the rad back on, refilled and bled, still the same

 

Panic over, Sorted it now. The AAV on the boiler was blocked solid and the boiler must have been air locked.