During tube filling, first check for pressure failed (Gray)
Last updated: February 22, 2026
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System error code: 86:01 on HP T790 T1300 T2300 Designjet Printer
System error code: 86:01 on HP T790 T1300 T2300 Designjet Printer See this video: https://youtu.be/Lhb-g4gKpKE Carriage ...
During tube filling, first check for pressure failed (Gray)
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Ensure carriage latch is properly engaged. Reseat the printhead. Replace the printhead.
Reference diagrams for common repair procedures related to this error:
Carriage Belt Replacement
Formatter Board Location & Connections
Note: These diagrams are for reference only. Always consult official HP service documentation and follow proper ESD precautions.
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