120 Troubleshooting
Pump not deliv-
ering eluent
Blown power fuse Replace the fuse (see Section 4.3, Replacing Fuses).
600E pump not
connected to 600
controller
Ensure pump interface cable is properly connected to
600 controller.
Attention: Never disconnect the pump from the
controller while the two devices are powered on.
Pump low pressure
limit set to a value
that is higher than
operating pressure
Set to the correct pressure limit (see the Waters 600E
Multisolvent Delivery System User’s Guide).
Pump not properly
set up (for example,
flow rate at zero)
Verify the pump setup parameters in the 600
controller (see the Waters 600E Multisolvent
Delivery System User’s Guide).
Pressure transducer
out of adjustment or
defective
Contact Waters Technical Service.
Pump not primed Prime the pump (see the Waters 600E Multisolvent
Delivery System User’s Guide, Chapter 3).
Immiscible eluents
in pump head
Purge pump with appropriate eluents. Verify misci-
bility of eluents being used (see the Waters 600E
Multisolvent Delivery System Operator’s Guide,
Appendix A) and change to more miscible eluents.
Dirty or malfunc-
tioning check valve
Refer to Section 5.4.1, Testing the Check Valves, to
determine if this symptom is due to a problem with
the inlet or outlet check valve.
Table 6-1 600E System Troubleshooting (Continued)
Symptom Possible Cause Corrective Action
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