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E2 error code is a over heat temperature fault.
Have you tried to power the appliance off for 20 minutes to see if it clears the code?
Ok im afraid its looking like the power boards in there are the fault here. Now there isn't much in an induction cooktop as you have 4 magnetic plates and the power boards. Now the plates never fail as its always the power boards that fail.
So im afraid its looking like the power boards are faulty here. Now if they say it need a new induction top then it must come as a complete unit so this isn't going to be a cheap fix here im afraid.