Let me say that this has been a fun project. I have finished building and wiring. I have the Rambo 1.4 that I purchased thru you. I have not touched the firmware. I am running on a mac. I plugged in the usb and connected thru Repetier Host. And then I get the notification of a thermal heater problem.
Did you put the firmware from the V1 site on the board? I suspect it’s complaining that you don’t have a heater probe installed if you’ve still got the default firmware on it.
The controller thinks there is a heater for an extruder. Marlin is designed for 3D printers, and we use it because it is useable for cnc machines and it supports a lot of boards. Repetier is also designed for 3D printers.
That menu wasn’t what I was talking about though. You can press a button after it connects to send a temperature command.
Can you try it again and when it errors out, copy the log and share it here?