CF023
MsgQue OverFlow
An exceptional instance occurred due to the unexpected Parameter in the System F/W.
Relevant Electrical Components, Units, and Options - MFP Control Board (PWB-MFP)
Try to reset it. If it is still showing up, you should try a new firmware version. If it is not working with a new firmware, you should check all the connection to the MFP Control Board. In the worst case scenario, you should change the board. I hope a reset will do the job
