Have you tried to clear the memory?
Can you make the mode switch go to "service mode" position, you may need the manager key for this
I'm not sure you can do this any other way the machine needs to go into service mode
Please leave this with me while I consult the service information
You do need the C key I'm afraid this is to get it to go into service mode
I am still awaiting an email to see if their is another way to do it but as it stands the master key or C key is what is required
The machines software has gone glitchy in all probability so anything can happen including additional errors