Turn off heated bed in Repetier?
A workaround would be to post-process your gcode files manually removing all M140 and M190 instructions (the one setting heated bed temperatures).

You can do that manually by opening your GCODE file in a text editor and searching for M140 and M190, but I recently had the same problem with Slic3r (Prusa edition) and I wrote a one-liner that does that automatically for me.