I can't get my Hotpoint hob to work!?

Hi

I have just bought a hotpoint ET7424 electric hob, and it is connected up to the mains. The touch controls work, but I don't know how to get it to heat up. I have followed the instructions in the manual exactly, but after about 10 secounds, it just turns itself off. Can anybody tell me how to operate this hob, Thanks

Rich.