This firmware error code is related to the detection of the Printhead cleaners by the line sensor. It always happens during initialization, while checking the Printhead Cleaners. In most case, it is a problem of incorrectly inserted Printhead Cleaners, but it can also be caused by an incorrectly assembled Service Station.
Try the following:
1. Remove the Printhead Cleaners and reinsert them again.
2. If the error still persists, perform the Service Station Calibration.
3. If the error still persists, an onsite visit is necessary to repeat the calibration or to change the Service Station assembly or the Carriage Assembly