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Error 0086-0004-0021Medium Severity

Temperature of the pen is beyond maximum margin

Last updated: February 22, 2026

Severity:Medium Severity
Affected:0 models
DIY Fix:Possible
HP Z9+ System error: 0021-0002-0017

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HP Z9+ System error: 0021-0002-0017

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What This Error Means

Temperature of the pen is beyond maximum margin

Step-by-Step Troubleshooting Guide
  1. 1

    Check which colors are still empty (if any), run the printer diagnostics, and check for 0086-0004-0nXX errors in the service plot to validate Primer & ISS. Replace printhead. Replace primer. Replace ISS.

Technical Service Diagrams

Reference diagrams for common repair procedures related to this error:

Carriage Belt Replacement

HP DesignJet Carriage Belt Replacement Diagram

Formatter Board Location & Connections

HP DesignJet Formatter Board Location Diagram

Note: These diagrams are for reference only. Always consult official HP service documentation and follow proper ESD precautions.

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