Hi there I have a Prusa I3 MK 2 upgraded to a MK2.5 that gives me the error "Mintemp bed". only on first startup in the morning. It works perfectly all other times. After switch on in the morning I preheat the machine and wait for the error then I just press reset and preheat again the machine works perfectly all day. Can someone give me an idea of the way to stop this error? Thanks Bob.