Working on a Dover DMC 1 was getting a fault saying defective control board not sending 150 volts to door operator, changed CLC board and now getting a fault saying Door Operator internal error, anybody have any suggestions

If you have a PY2 or PY4 door board, make sure there is a Capacitor wired from P150 to G150 in the controller. Other than that and checking your 12v (10.75), I think all you can do is replace the door board.