Do you have the model number please.
Also do you get a number flash up after the U?
Thanks for that. U means theres a fault on there but there should also be a number comming up as well.
So you say it shows U on the right hand side does it flash a number on the left hand side?
Also is the left hand side of the hob still working as well?
Thats it thats the full error code.
U1 error code means a problem on the supply voltage of the hob.
What you can try first is turn the electric supply off to the hob and leave it for about 20-30 minutes as this will allow the componments in there to discharge themselves.
Then turn it back on and see how it goes from there. Fingers crossed this clears it and gets it running again as normal.
But if its the same still then you need to remove the hob from the worktop. Then turn the hob over and there you will see the mains connection were the power cable goes to.
Open this up and check for signs of burning. If you have a multi meter you need to check the volatge there and check there 230v there as well.
But if thats fine and turning it off hasnt reset it and the correct voltage is there then its going to be a faulty power board as to be honest thats all that ever fails on these.
But try turning it off first for about 20 minuites as theres a good chance this could clear it.
Let me know how it goes.