Google states:
"The display of the MIGHTY shows: ERR 004. The Vaporizer is faulty. In this case, disconnect from the mains without delay and get in touch immediately with our Service Center. Do not leave the device unat- tended during operation."
Maybe someone else can chime in that knows more, but In the mean time it may be worth sending the retailer a message
"The display of the MIGHTY shows: ERR 004. The Vaporizer is faulty. In this case, disconnect from the mains without delay and get in touch immediately with our Service Center. Do not leave the device unat- tended during operation."
Maybe someone else can chime in that knows more, but In the mean time it may be worth sending the retailer a message