Hi, welcome to Just answer
How old is this hob ?
OK, so do you mean it is giving ER 03
OK, is it also showing "L" or just this Er and then 03 ?
OK, unplug it for few minutes then plug it back and press & hold the ON/OFF button..."L" will be displayed then after this immediately press the "-" button and the "+" button of the front right and then again press the "-" button of this zone
let me know how it goes
OK ...sorry about the bad news.. ER 03 means power supply fault..you will have to take the hob out and check the wiring to the control, also check if anything is burned out...if all looks good then the main control unit will need replacement..this part itself will cost around £200
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