Error 0021-0004-0001Medium Severity

Primer zero sensor malfunction, error status or state

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 zero sensor malfunction, error status or state

Step-by-Step Troubleshooting Guide

1
Reboot, Check the Primer zero Sensor for damage, repalce primer zero sensor, replace Primer motor, repalce Mechatronics 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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Optical or mechanical sensors that detect the presence, type, width, and position of print media loaded in the printer.

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Primer zero sensor malfunction, error status or state

HP Z9+ System error: 0021-0002-0017

Carriage Belt Replacement

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