The emergency stop (E-stop) circuit was open at power up.
For more information, see "DCC Error Codes".
What you should do:
Some systems have console E-stop buttons that lock when pressed. If locked, twist knob clockwise to release.
To clear the error, power the MP down.
Power the MP back up.
Check all E-stop buttons and the circuit to see if any are open.
If the error reoccurs, contact your Giddings & Lewis service representative.