MAINTENANCE
Troubleshooting
34
Symptom Based Troubleshooting
Condition
Display
Possible Cause
Corrective Action
No Water
• No supply voltage present
• If correct voltage is present, replace drive
• Pressure sensor circuit
• Verify water pressure is below system set point
1-7
• Fault detected
• Underload
• Refer to
“Diagnostic Fault Codes” on page 32
• Repair or replace the required foot valve for pump applications
with suction lift
rapid
• Power surge
• Bad component
• Internal Fault
• Turn off power to clear the fault and verify input voltage.
• If repetitive, replace drive
• Loose switch or cable
connection
• Gulping water at pump inlet
• If frequency max with low amps, check for closed valve or stuck
check valve
• If frequency max with high amps, check for hole in pipe
• If frequency max with erratic amps, check pump operation,
dragging impellers
• This is not a drive problem; check all connections, disconnect
power, allow well to recover and retry
• Confirm max amps setting is set correctly
• Confirm Underload Sensitivity is set correctly
• Invalid Configuration
• A max amps setting is not configured for PSC or CEN applications
Pressure Fluctua
-
tions (Poor Regu
-
lation
• Pressure sensor placement
and setting
• Pressure gauge placement
• Pressure tank size and pre-
charge
• Leak in system
• Air in pump intake (lack of
submergence)
• System response setting
• Correct pressure sensor placement and settings
• Tank may be too small for system flow
• This is not a drive problem
• Disconnect power and check pressure gauge for drop
• Set deeper in the well or tank; install a flow sleeve with airtight
seal around drop pipe and cable
• If fluctuation is only on branches before sensor, enable Steady
Flow
• Adjust System Response value
