Waters Prep Series Installation And Maintenance Manual page 108

General system troubleshooting (Continued)
Symptom
No response from
keypad
Fluid system troubleshooting
The table below addresses potential pump unit symptoms that can arise
during operation.
Pump troubleshooting
Symptom
Pump will not run
3-24 Troubleshooting, Testing, and Maintenance
Possible cause
Keypad is locked
Keypad is broken
CPU in Hold mode
Possible cause
Loose control cable
High pressure limit set
to 0
Broken plunger
jamming the pump
Defective pump motor
Defective circuit board
Defective pump
transducer
Corrective action
Unlock keypad on
PUMP SETUP screen.
Check keypad.
Call Waters Technical
Service.
Corrective action
Reattach cable to rear
of fluid handling unit.
Set higher pressure
limit on PUMP SETUP
screen.
Replace damaged
plunger.
Call Waters Technical
Service.
Call Waters Technical
Service.
Replace pump pressure
transducer.