hi @eschbow This might be caused by the corrupted connection wire. To test the wiring status, pls exchange the heating wire and thermistor connector of the hotbed on the main board to the position of nozzle’s.
And then set the nozzle temp to 60 on the display and check if the hotbed is heating up to around 60. If the hotbed could be normally heated up, the heating wire and thermistor connector on the mainboard might be corrupted. If the hotbed would not heat up after you swap the wires, the hotbed is corrupted. In this case, please contact the CS at info@sovol3d.com for assistance.