Agilent LC 1260 minimum stroke

Dear Sirs,

 

Please help me with the following question relating to our LC 1260.

 

Recently we had a problem with pump A for error: Servo restart failed/ Stroke length misadjustment

 

We did change the new active valve cartridge, new pump seal, PTFE frit, Purge valve cap. If  I choose minimum stroke as "automatic", the error still happens. When I change the minimum stroke to 50, the pump was running normally.

 

Can you explain what was wrong with this pump?

 

Thank you very much for your time of consideration.

 

Best regards,

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