The HP Designjet error code displayed on your large format (wide format) printer e.g. 11:11 86:01 79:04 does not always provide an exact indication of the problem or issue - and you (the user) will often be unable to diagnose or fully resolve the Designjet fault yourself - even with the error code information provided here.
HP Designjet error codes are not an exact science. They exist to help the engineer diagnose key areas for assessment, and can often indicate one or more parts have failed. It is not unknown for HP engineering manuals to omit reasons for certain error codes (or even omit the error codes themselves!). This is where it pays to engage experts in the field of HP Designjet repairs so that you receive the fastest and most cost effective fix. Based upon the reported fault, a trained and qualified HP Designjet engineer will usually work through a pre-defined set of tests and apply many years of working knowledge to effect the fastest repair - choosing those parts first which he knows will usually resolve the fault rather than systematically working through the manual.
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