Broken induction hob + hand mixer (Leeds city centre, LS12)

Error code E4 on induction hob and don’t know how to fix it. Tried leaving it and putting in different socket but no avail. If anyone happens to be a wizz at electronics they are welcome to try and fix it and keep it for themselves. From googling it may be a faulty temperature sensor or overheating. Likewise hand held mixer broken and not sure why.