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Pump
Troubleshooting
Below is a list of common problems
and the probable causes:
WARNING: Before handling
pumps and controls, always
disconnect power first. Do
not smoke or use sparkable
electrical devices or flame in a
septic (gaseous) or possible
septic sump.
Pump will not start.
1. No power to the motor. Check
for blown fuse or open
circuit breaker.
2. Selector switch may be in the
Off position.
3. Control circuit transformer
fuse may be blown.
4. Overload heater on starter may
be tripped. Push to reset.
Pump
will
not
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 the same reading.
3. If no grounds exist and the
motor windings check OK,
remove pump from sump
and 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 3900
control, put selector switch in
Auto position and turn off
main power. Put a jump wire
between 2 and 3 on terminal
strip. Turn on power and
if pump starts, trouble is in
the
Replace control.
If pump does not start, turn
off power, remove jumper
from 2 and 3 and put jumper
wire
terminals.
Turn on power and if pump
starts, trouble is in upper control.
Replace control.
If pump does not start, turn off
power and put jumper between
2 and 3 and 1 and 2 and turn on
power. If pump starts, both
lower and upper controls are
defective. If pump still does not
start, trouble is in the alternating
relay. Replace with new relay.
Pump runs but will not shut off.
1. Pump may be air locked. Turn
pump off and let set for several
minutes, then restart.
start
and
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.
lower
3900
control.
between
1
and
Total head is discharge gauge
pressure converted to feet
plus vertical height from
water level in sump to center
line of pressure gauge in
discharge line. Gauge should
be installed on pump side of
all valves. Multiply gauge
presure in pounds by 2.31 to
get head in feet.
2
5. If pump has been in service for
some time and capacity falls
off, remove pump and check
for wear or clogged impeller.
Motor stops and then restarts
after short period but overload
heaters in starter do not trip.
1. This indicates heat sensors in
the motor are tripping due to
excessive heat. Impeller may
be partially clogged, giving a
sustained overload but not
high enough to trip overload
heater switch.
2. Motor may be operating out
of liquid due to a failed
level control. All Hydromatic
S4LRC submersible motors
can operate for extended periods
out of water without burning
up the winding, but the heat
sensors give motor prolonged
life by controlling winding
temperature.
3. Pump may be operating on a
short cycle due to sump being
too small or from water returning
to sump due to a leaking
check valve.
9
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