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Symptom Based Troubleshooting
Condition
Display
Home Screen at
No Water
Fault Code
Motor Frequency
Pressure Fluctua-
tions (Poor Regu-
Motor Frequency
lation)
Run On
Motor Frequency
(pump won't stop)
Possible Cause
• No supply voltage
present
None
• Control Board cable
disconnected or loose
• Pressure sensor circuit
0 Hz
• Fault detected
• Drive and motor are
operating, but the max
frequency was set too
low to lift/pump/
produce water
• Loose switch or cable
connection
• Incorrect motor or pump
settings
• Motor may be running
backwards
• Gulping water at pump
inlet
• 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
• Pressure sensor
placement and setting
• Tank pre-charge
pressure
• Impeller damage
• Leaky system
• Sized improperly (pump
can't build enough
head)
Corrective Action
• Verify cable connection between Power Board and Control
Board
• If correct voltage is present, replace drive
• Verify water pressure is below system set point
• Ensure auxiliary device is connected and closed circuit
• Jumper wires together at pressure sensor; if pump starts,
replace sensor
• If pump doesn't start, check sensor connection at J14; if loose,
repair
• If pump doesn't start, jumper sensor connection at J14. If
pump starts, replace wire
• If pump doesn't start with new sensor, replace drive
• Refer to
"Diagnostic Fault Codes" on page
• Verify Maximum Frequency setting.
• Verify motor/pump ratings and match to motor/pump
settings on drive
• Verify motor connections
• Frequency max, amps low, check for closed valve, or stuck
check valve
• Frequency max, amps high, check for hole in pipe
• Frequency max, amps erratic, check pump operation,
dragging impellers
• This is not a drive problem
• Check all connections
• Disconnect power, allow well to recover and retry
• 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
• Change tank size configuration
• Reduce frequency output range
• Adjust System Response value
• Check frequency at low flows, pressure setting may be too
close to pump max head
• Verify precharge at 70% if tank size is larger than minimum,
increase precharge (up to 85%)
• Verify that the system will build and hold pressure
• Enable bump and/or aggressive bump
• Increase minimum frequency
MAINTENANCE
Troubleshooting
37.
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