4-6 Troubleshooting
Pump Motor Driver HW
Fault
The electronics detected an over-current
condition on the pump motors. If this message
persists, call Waters Technical Service.
Pump Motor Lost
Synchronization
A requested pump motor movement failed its
encode feedback check. This is usually caused
by pressures exceeding 34,500 kPa (345 bar,
5000 psi) at flow rates over 100 mL/min.
Solvent Select Valve HW
Failure
The electronics detected an over-current
condition in the manifold circuitry. If this
message persists, call Waters Technical
Service.
Stop Flow Input Activated The pump was stopped through the Stop Flow
input on the rear panel.
Stop Flow Key pressed The pump was stopped from the Stop Flow
button on the instrument.
System Over Pressure The system pressure exceeded the method-
defined high-pressure limit. This may be
caused by:
• a bad transducer or transducer connection
• a stoppage in the system such as a clogged
injector, plugged column, bent tubing, etc.
System Under Pressure The system pressure was below the method
defined low-pressure limit for over 30 seconds.
Possible causes include a leak, loss of flow,
check valve malfunction, or setting the
low-pressure limit too high.
Explanation of error message (Continued):
Error message Explanation
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