1100 Series Nano Pump Service Manual 95
Troubleshooting and Test Functions 2
EMPV failed to initialize (micro mode only)
An attempt to pump in the micro mode has resulted in either an EMPV
Initialization Failed error message, or a permanent EMPV Initialization not
ready message.
Make sure the system pressure is higher than 20 bar.
Table 8 EMPV failed to initialize: Possible Causes and Suggested Actions
Possible Causes Suggested Actions Notes
The no-flow pressure of the system
is higher than 10 bar.
• Set the flow to zero, and disconnect the blue
flexible capillary going from the damper to the
mixer The system pressure reading should be
close to zero bar.
• If the system pressure reading is higher than 4
bar, call Agilent service, or refer to the Nano Pump
Service Manual.
This problem typically causes
a permanent EMPV
Initialization not ready
message.
The inlet to the EMPV has been
blocked, or partially restricted. The
EMPV cannot take in sufficient
flow to deliver the correct flow
output. The EMPV initialization
routine cannot be done within the
required 2-minute period.
• Make sure the solvent channels are well purged.
• Check the EMPV filter. Perform a pump purge at
1000 µl/min using pure water. During the purge,
check system pressure. If pressure is >10 bar,
replace the filter in front of the EMPV.
• Check the flow path from the damper outlet to the
EMPV inlet for plugs or restrictions.
• Check the EMPV-to-flow sensor capillary for a
total plug or partial restriction. Replace the
capillary, or backflush the capillary with acetone.
• Replace the EMPV assembly (G1361-60000). Call
Agilent service or refer to the Nano Pump Service
Manual "Exchanging the EMPV Assembly" on
page 117.
This problem typically causes
an EMPV Initialization Failed
error message
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