7
Below is a list of common
problems and the probable causes:
Pump will not start
1. No power to the motor.
Check for blown fuse
or tripped circuit.
2. Hand-off-auto switch may be
in the off position.
3. Control circuit transformer
fuse may be blown.
4. Overload relay on starter may
be tripped. Push to reset.
Pump will not start and
overload heaters trip
1. Turn off power and check
motor leads with megger or
ohmmeter for possible ground.
2. Check resistance of motor
windings. All 3 phases
should show close to the
same reading.
3. If no grounds exist and the
motor windings check O.K.,
remove pump from sump
0and check for clogged or
blocked impeller.
Pump operates with selector
switch in hand position but will
not operate in auto position
1. This indicates trouble in the
float level control or the
alternator relay.
2. To check for defective float
control put selector switch in
auto position and turn off main
power. Put a jumper wire on
terminal strip. Turn on power
and if pump starts, trouble is in
float control. Replace control.
Pump
Troubleshooting
Pump runs but will not shut off
1. Pump may be air locked. Turn
pump off and let set for
several minutes then restart.
2. Lower float control may be
hung-up in the closed position.
Check in sump to be sure
control is free.
3. Selector switch may be in the
Hand position.
Pump does not deliver proper
capacity
1. Discharge gate valve may
be partially closed or
partially clogged.
2. Check valve may be partially
clogged. Raise level up and
down to clear.
3. Pump may be running in
wrong direction. Low speed
pumps can operate in reverse
direction without much noise
or vibration.
4. Discharge head may be too
high. Check total head with
gauge when pump is
operating. Total head is
discharge gauge pressure
converted to feet plus vertical
height from water level in
sump to center line of pressure
gauge installed in discharge
line. Gauge should be installed
on pump side of all valves.
Multiply gauge pressure in
pounds by 2.31 to get head
in feet.
5. If pump has been in service for
some time and capacity falls
off, remove pump and check
for wear or clogged impeller.
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