Error Messages and Error Codes 67Error CodesError codes are six-digit numbers that appear on the control panel when errors occur. Such errors includeabnormal print jobs and printer malfunctions.Error codes provide important information that identifies the causes of errors. Please have the applicableerror codes on hand when calling our Customer Support Center or your dealer.The following table lists the error codes that can be resolved by users. When an error code is displayed, seeif it is listed in the following table.The following error codes are listed in ascending order.Note• XPS stands for XML Paper Specification.• See the ‘User Guide’ for error codes that are not listed here.Error Code Cause/Remedy016-400 The 802.1x user name and password are wrong.Check the user name and password and enter them correctly. If this does not solve the problem,check for problems with your network environment.016-401 802.1x authentication protocol cannot be processed.Reconfigure the printer's authentication protocol so it matches that of the authentication protocolof the authentication server.016-402 The authentication connection timed out.Check the switch setting of the authentication device connecting the printer and physical network,and/or the network connection.016-403 The root certificate does not match.Check the authentication server and store the root certificate of the authentication server'scertificate on the printer.If you are unable to obtain the root certificate of the server certificate, Set [Verify SrvrCert] under[IEEE 802.1x] to [Disabled].016-404 An internal error occurred.Re-try the same operation. If this does not correct the situation, it could indicate a mechanicalproblem. Contact our Customer Support Center or your dealer.018-400 The printer's IPsec setting is incorrect.When the authentication method is set to [Preshared Key], change the password. If it is set to[Digital Signature], change the IPsec certificate.027-400 Communication with the printer failed.If another message is displayed, check its contents. If a panel operation is in progress, exit it. Ifremote access is in progress, wait until the access is complete. If this does not resolve theproblem, switch the power off and then back on again. If this does not resolve the problem,contact our Customer Support Center or your dealer.027-442 IPv6 IP addresses are duplicated.Change the printer's IPv6 “Auto Stateless Address 1” or the network device IPv6 address toeliminate the IP address duplication.027-443 IPv6 IP addresses are duplicated.Change the printer's IPv6 “Auto Stateless Address 2” or the network device IPv6 address toeliminate the IP address duplication.027-444 IPv6 IP addresses are duplicated.Change the printer's IPv6 “Auto Stateless Address 3” or the network device IPv6 address toeliminate the IP address duplication.027-445 A manually set IPv6 IP address is wrong.Re-configure the IPv6 address correctly.027-447 IPv6 addresses are duplicated.Change the printer's IPv6 Link Local Address or the network device IPv6 address to eliminate theIP address duplication.