Minolta copier EP 2030 error code C 04. Once again Thanks for your solution. After about 3 weeks

Question

Once again Thanks for your solution. After about 3 weeks of work the copier again shows the same code. I could reset the machine, so now it works again. The two cooling fans that I see are running. Might the reason for overheating be too much dirt in the machine? My wife reports that she sometimes saw a "Cloud" coming out of the copy output.