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 you press them. If locked, twist the knob clockwise to release it.
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.