Hello

I am having some strange issues with my self built i3 prusa Hephestos:
We used to have an older printer with a heatbed (Mk2A) that we reused for the newly bought i3 prusa hephestos kit.
Now we connected everything to the board according to the manual and configured the firmware properly for it to work.

When we start up Repetier host we see the heatbed connected and also can heat it.
However it seems that always after a certain time the error "Bed sensor error" (or similar, can't remember the exact words) appears in the console and the printer enters dry mode.

Now as we mostly only print with PLA I deactivated the heatbed in the firmware as it caused the printer to stop its print while he was printing.
We checked all the cables for faulty contacts, but as repetier host sees the heatbed for the first few minutes shows me that it is not a faulty connection problem. Also when I just restart Repetier host and reset the printer after the error occours, the heatbed is there and working again for a few minutes until the error appears again.

Does anyone know what could cause this issue?
We are suspecting that we might have broke the heatbed somehow when removing it from the old printer and installing it on the new one.

Firmware used: Repetier firmware 0.92 beta (also occoured with 0.91)