The system is configured for Temperature Compensation. The Temperature Compensation board is present, but an invalid A/D value occurred for a required input.
What you should do:
To clear the error, click Clear error in the XYZ Display window.
To clear it using an RCU-II, press and hold down the Servo Power Off button and then press the Joy button twice.
If the error reoccurs, contact your Giddings & Lewis service representative.