14
TROUBLE SHOOTING
CAUTION !
Always disconnect the pump from the electrical power source before handling.
If the system fails to operate properly, carefully read instructions and perform maintenance recommendations.
If operating problems persist, the following chart may be of assistance in identifying and correcting them:
MATCH “CAUSE” NUMBER WITH CORRELATING “CORRECTION” NUMBER
.
NOTE:
Not all problems and corrections will apply to each pump model.
PROBLEM
CAUSE
CORRECTION
Pump will not run
1.
Poor electrical connection, blown fuse, tripped
breaker or other interruption of power, improper
power supply.
2.
Motor or switch inoperative (to isolate cause, go
to manual operation of pump).
2a.
Float movement restricted.
2b.
Switch will not activate pump or is defective.
2c.
Defective motor
3.
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.
2a. Reposition pump or clean basin as required to
provide adequate clearance for fl oat.
2b. 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 ohmmeter
shows zero ohms for closed switch and full scale
for open switch. (Float Switch).
2c. Check winding insulation (Megger Test) and
winding resistance. If check is outside of range,
dry and recheck. If still defective, replace per
service instructions.
3. Make sure liquid level is at least equal to
suggested turn-on point.
4. Recheck all sizing calculations to determine
proper pump size.
5. Check discharge line for restrictions, including
ice if line passes through or into cold areas.
6. Remove and examine check valve for proper
installation and freedom of operation.
7. Open valve.
8. Check impeller for freedom of operation,
security and condition. Clean impeller and inlet of
any obstruction.
9. Loosen union slightly to allow trapped air to
escape.Verify that turn-off level of switch is set so
that the suction is always fl ooded. Clean vent hole.
10. Check rotation. If power supply is three phase,
reverse any two of three power supply leads to
ensure proper impeller rotation.
11. Repair fi xtures as required to eliminate
leakage.
12. Check pump temperature limits & fl uid
temperature.
13. Replace portion of discharge pipe with fl exible
connector.
14. Turn to automatic position.
15. Check for leaks around basin inlet and outlets.
Pump will not turn off
2a. Float movement restricted.
2b. Switch will not activate pump or is defective.
4. Excessive infl ow or pump not properly sized for
application.
9. Pump may be airlocked
14. H-O-A switch on panel is in “HAND” position
Pump hums but does not run
1. Incorrect voltage
8. Impeller jammed or loose on shaft, worn or
damaged, impeller cavity or inlet plugged.
Pump delivers insuffi cient capacity
1. Incorrect voltage.
4. Excessive infl ow or pump not properly sized for
application.
5. Discharge restricted.
6. Check valve stuck closed or installed backwards.
7. Shut-off valve closed.
8. Impeller jammed or loose on shaft, worn or
damaged, impeller cavity or inlet plugged.
9. Pump may be airlocked.
10. Pump running backwards
Pump cycles too frequently or runs
periodically when fi xtures are not in use
6. Check valve stuck closed or installed backwards.
11. Fixtures are leaking.
15. Ground water entering basin.
Pump shuts off and turns on independent of
switch, (trips thermal overload protector).
CAUTION!
Pump may start unexpectedly.
Disconnect power supply.
1. Incorrect voltage.
4. Excessive infl ow or pump not properly sized for
application.
8. Impeller jammed, loose on shaft, worn or dam-
aged, impeller cavity or inlet plugged.
12. Excessive water temperature.
(internal protection only)
Pump operates noisily or vibrates excessively
2c. Worn bearings, motor shaft bent.
5. Debris in impeller cavity or broken impeller
10. Pump running backwards
13. Piping attachments to buiding structure too
rigid or too loose.
