Kyocera Ecosys FS-C2126MFP+ Operation Manual page 196

Error Code
U14000 Reception to the Sub Address Box was stopped
because there is no more free space in the
memory of this machine. Create free space by
outputting the data stored in the memory, or
cancel the reception to the Sub Address Box.
U14100 Transmission to the Sub Address Box or sub
address box on our-brand recipient machine was
stopped because there is no more free space in
the memory of the recipient machine. Check with
the recipient.
U19000 Memory reception was stopped because there is
no more free space in the memory of this
machine. Create free space by outputting the data
stored in the memory, and ask the sender to
resend.
U19100 Transmission was stopped because there is no
more free space in the memory of the recipient
machine. Check with the recipient.
U19300 Transmission was stopped due to a data error
occurring during transmission. Send again.
Possible Cause/Action
Appendix-15