Grundfos DPC 2-1 - Troubleshooting Guide; Fault Message Interpretation; Identifying Possible Causes; Recommended Solutions

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Fault message
Possible cause
Solutions
Flashing of UNDER V
The real running voltage is
lower than the set voltage,
pump is in under voltage
protection state.
Report low line voltage to the
power supply company.
Control will attempt to restart
the pump every 5 min until
line voltage is restored to
normal.
Flashing of OVER V
The real running voltage is
higher than the set
voltage, pump is in over
voltage protection state.
Report high line voltage to the
power supply company.
Controller will attempt to
restart the pump every 5 min
until line voltage is restored to
normal.
Flashing of OVERLOAD
The real running ampere is
higher than the calibrated
/ set running ampere, pump
is in overload protection
Controller will attempt to
restart the pump every 30
min until running ampere is
restored to normal.
Inspect pump and motor
winding.
Flashing of
PUMP NO
CALIBRATION
Parameter calibration not
completed.
Refer to parameter
calibration setting.
Flashing of DRY RUN
Liquid level in the well/
sump is below the pump
intake, pump stops
running.
Controller will attempt to
restart the pump every 30
min until liquid level is above
the pump.
Flashing of
PUMP STALLED
Pump running amps
exceeded normal run amps
by more than 200%.
Cut off power supply and repair
or replace pump.
Flashing of
REPEATED START
Pump starts more than 5
times per minute.
Check pressure tank precharge
Check pressure tank bladder
Check pressure switch settings
Check pressure switch for
defects.
No communication link
between SC / computer and
control.
Connect the control to SC
/ computer to realize long
distance monitoring.
TROUBLE SHOOTING GUIDE
NOTE: Float/pressure switch should be ordered separately.