Thanx a lot for the info, may be I will need it in future

but now it prints really good, I think it was a problem with printing with ABS at high temperatures, I tried to print at 245C and this error came up but now I'm printing at 230-240C all is ok. May be it was because at printer settings in Repetier I put 230C as a "Default Extruder Temperature" and 70C as "Default Heated Bed Temperature" So I think it was my fault or I'm wrong?!