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i guess its the controll board. i own a junior 1.0 and a month ago after not using it for 3/4 year (no filament was avaible or overpriced) it showed me error 004 and temp was shown with 384° from start. After changing the Printhead against a new result was same. I then decided to buy a showroom-used junior mini w and a open smart tag at comprise.de (wich also have a repair-center for xyz-printers) cause repair would be likely same price and the old junior 1.0 also had a break in its printbedholder wich resulted in a difference of half a layer.