6
Troubleshooting information for
pump only. For other questions
or problems,
please contact
your authorized Hydromatic
service center.
Servicing should be performed
only by an authorized Hydromatic
service center.
WARNING: Always disconnect
the pump from power source
before handling or making any
adjustments. Always wear
rubber boots when there is
water on the floor and you must
unplug the pump or make
any adjustments.
NOTE:
Automatic thermal
overload protects the
sealed-in-oil motor. Running
dry may overheat the motor and
activate the overload protector
until the motor cools.
Pump does not run or
just hums.
1. Line circuit breaker may be
off, blown or loose.
2. Water level in sump may
be too low to activate
automatic float.
3. Power cord plug may not be
making contact in receptacle.
4. If all symptoms check OK,
motor winding may be
open; take to authorized
service center or distributor for
check.
Pump runs but does not deliver
water, or small amount of water.
1. Check valve may be installed
backward. Arrow on valve
points in direction of flow.
2. Discharge gate valve, if used,
may be closed.
3. Pump may be air locked. Start
and stop several times by
plugging and unplugging cord.
Check vent hole in pump case
for plugging.
Hydromatic pumps have a small
air vent hole in the impeller cavity
to let out trapped air. If this hole
becomes plugged, pump may air
lock. To break the air lock, use a
small screwdriver to clear hole in
the impeller cavity.
As a secondary precaution in
installations of this type — 1⁄16"
hole should be drilled in the
discharge pipe below the check
valve. The check valve should be
12 to 18 inches above pump
discharge. Do not put check valve
directly into pump discharge
opening.
NOTE: In sumps where the
pump is operating daily, air
locking rarely occurs.
4. Pump head may be too high.
Pump cannot deliver water
over 21.0' vertical lift.
Horizontal distance does not
affect pumping, except for
friction loss through the pipe.
5. Inlet in pump base may be
clogged. Remove pump and
clean out openings.
6. Impeller or volute openings
may be plugged or partially
plugged. Remove pump and
clean out.
7. Pump impeller may be
partially clogged causing
motor to run slow, resulting in
motor overload. Clear
impeller.
Fuse blows or circuit breaker
trips when pump starts.
1. Inlet in pump base may be
clogged. Remove pump and
clean out openings.
2. Impeller or volute openings
may be plugged or partially
plugged. Remove pump and
clean out.
3. Pump impeller may be
partially clogged causing
motor to run slow, resulting in
motor overload. Clear
impeller.
4. Fuse size or circuit breaker is
too small.
5. Defective motor stator: return
to authorized Hydromatic
service center or distributor
for verification.
Motor runs for short time
then stops. Then after short
period starts again. Indicates
tripping overload caused by
symptom shown.
1. Inlet in pump base may be
clogged. Remove pump and
clean out openings.
2. Impeller or volute openings
may be plugged or partially
plugged. Remove pump and
clean out.
3. Pump impeller may be
partially clogged causing
motor to run slow, resulting in
motor overload. Clear impeller.
4. Defective motor stator; return
to authorized Hydromatic
service center or distributor.
Pump
Troubleshooting