Hot-End 2 and bed heats up same time (2 replies)

Hello friends of 3d printing,

i am currently upgrading my Velleman 3D Printer for Dual Print Heads (from RepRapPros triocolor design).
i have exchanged the controller board with a ramps 1.4.
Its working so far, except that when i heat up the bed, the Extruder 2 (D9) heats up too
and vise versa. The LEDs for D8 and D9 are both on than.

Is this a configuration or electronic problem?
I have changed the configuration of marlin to board 34 and set the extruder count to 2.
Its possible to print in dual mode, but i cannot control the bed this way.

I appreciate any advice for a solution.
Please let me know if you need more information.