Error 0021-0004-0162Medium Severity

Primer pump 1 in the Engine PCA is over-temperature

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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What This Error Means

Primer pump 1 in the Engine PCA is over-temperature

Step-by-Step Troubleshooting Guide

1
Restart. Check pump and connectors properly connected? not broken, dirty,damaged? Run the 02103 Check Primer motor, replace Primer pump, replace Engine PCA

Technical Service Diagrams

Reference diagrams for common repair procedures related to this error:

Carriage Belt Replacement

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

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Glossary Terms

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Related Glossary Terms

PCA (Printed Circuit Assembly)

The main logic board inside an HP DesignJet printer that controls all operations, including processing print jobs, managing ink delivery, and communicating with connected devices.

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