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SYMPTOM
Pump Fails To Start
Pump Fails to Deliver Full
Output
Water in Mechanical
Seal Oil
ST4/ST6 SERIES SUBMERSIBLE PUMPS • OPERATION MANUAL — REV. #4 (03/04/24) — PAGE 31
Table 9. Pump Troubleshooting
POSSIBLE PROBLEM
Incorrect voltage/amps?
Check electrical connec-
tions?
Blown power fuse or tripped
circuit breaker?
Impeller locked?
Wet motor windings?
Defective motor and pump
bearings?
Twisted or restricted dis-
charge hose?
Clogged pump strainer?
Low voltage?
Impeller worn?
Defective mechanical seal?
Loose Oil Fill Plug?
TROUBLESHOOTING
SOLUTION
Check that the proper voltage, 230 or 460 VAC, 60
Hz, 3-phase is being supplied to the pump. Also
check that there is an adequate amount of current
(amps) to run the pump. Check power source circuit
breaker.
If using float switches check wiring, inspect power
cord.
Replace fuse check circuit breaker, check cause of
blown fuse or tripped breaker.
Disconnect power cord and check for clogging. Un-
clog pump. Check overload protection device.
Use multimeter to check motor insulation. Insulation
resistance must be approximately 15 megaohms. If
resistance is low, disassemble pump motor and bake
windings to dry them.
Check for excessive bearing wear, if worn replace
bearings. Replace motor if defective.
Lay hose flat un-kinked. Remove clog from hose line.
Clean strainer.
Use a voltmeter to check voltage while pump is
energized. Voltage must be within ±10%. Check
power source (no load and load). If an extension cord
is used, make sure it has adequate current-carrying
capacity for the required length.See Table 5.
Replace impeller.
Replace mechanical seal.
Tighten securely. Apply teflon tape.
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