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13
Troubleshooting Chart
Always disconnect the pump from the electrical power source before handling. If the system fails to operate
properly, carefully read instructions and perform maintenance recommenda-tions. If operating problems
persist, the following chart may be of assistance in identifying and correcting them.
NOTE: Not all problems and corrections will apply to each pump model.
Symptom Possible Cause (s) Corrective Action
Pump will not run 1. Poor electrical connec-
tion, blown fuse, tripped
breaker, or other interrup-
tion of power; improper
power supply
2. Motor or switch inoperative
3. Float movement restricted
4. Switch will not activate
pump or is defective
5. Defective motor
6. Insuffi cient liquid level
1. Check all electrical connections for security.
Have electrician measure current in motor
leads. If current is within ± 20% of locked rotor
Amps, impeller is probably locked. If current is
0, overload may be tripped. Remove power,
allow pump to cool, then recheck current
2. Go to manual operation of pump
3. Reposition pump or clean basin as required to
provide adequate clearance for fl oat
4. Disconnect level control. Set ohmmeter for a
low range, such as 100 ohms full scale and
connect to level control leads. Actuate level
control manually and check to see that ohm-
meter shows zero ohms for closed switch and
full scale for open switch (Float Switch)
5. Check winding insulation (Megger Test) and
winding resistance. If check is outside of range,
dry and recheck. If still defective, replace per
service instructions
6. Make sure liquid level is at least equal to sug-
gested turn-on point
Pump will not turn off 1. Float movement restricted
2. Switch will not activate
pump or is defective
3. Excessive infl ow or pump
not properly sized for ap-
plication
4. Pump may be airlocked
1. Reposition pump or clean basin as required to
provide adequate clearance for fl oat
2. Disconnect level control. Set ohmmeter for a
low range, such as 100 ohms full scale and
connect to level control leads. Actuate level
control manually and check to see that ohm-
meter shows zero ohms for closed switch and
full scale for open switch (Float Switch)
3. Recheck all sizing calculations to determine
proper pump size
4. Loosen union slightly to allow trapped air to
escape. Verify that turn-off level of switch is set
so that impeller cavity is always fl ooded. Clean
vent hole
Pump hums but doesn’t run 1. Incorrect voltage
2. Impeller jammed or loose
on shaft, worn, or dam-
aged, impeller cavity or
inlet plugged
1. Check all electrical connections for security.
Have electrician measure current in motor
leads. If current is within ± 20% of locked rotor
Amps, impeller is probably locked. If current is
0, overload may be tripped. Remove power,
allow pump to cool, then recheck current
2. Check impeller for freedom of operation, se-
curity, and condition. Clean impeller cavity and
inlet of any obstruction
Pump cycles too frequently
or runs periodically when
fi xtures are not in use
1. Check valve stuck closed
or installed backwards
2. Fixtures are leaking
3. Ground water entering
basin
1. Remove and examine check valve for proper
installation and freedom of operation
2. Repair fi xtures as required to eliminate leakage
3. Check for leaks around basin inlet and outlets
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