Troubleshooting
33
P 2.1S/P 4.1S user manual V6870, version 3.1
6. Replace the patch cable to the device with that no connection could be
established.
Has this been successful?
7. Make sure that the IP port of the device matches the port in the chromatog-
raphy software.
Error List and Solutions
Problem
Solution
Pump will not turn
on
Power cable needs to be connected to power supply
and power adapter has to be turned on.
• Inspect the power cable to ensure that it is plugged
into the power supply.
When purging, the
pump switches off
The venting screw on the pressure sensor must be
turned up.
• Check if the venting screw on the pressure sensor is
turned open.
Pump does not
transport solvent
Check the following options:
• Purge the pump head so as to remove the air bub-
bles
• Inspect the eluent inlet and filter of the HPLC column
and change when blocked.
• Replacing the pump head
• Clean the check valves
• Exchange the check valves
• If the pump head seals are defective, solvent enters
the piston backflushing; inform the technical support
of KNAUER.
Pressure or flow rate
fluctuations
Check the following options:
• Purge the pump head so as to remove the air bub-
bles
• Always tighten the inlet screw and outlet screw on
the pump head with a torque wrench and 7.5 Nm.
Clean the check valves
• Exchange the check valves
