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ST2010 SERIES SUBMERSIBLE PUMP • OPERATION AND PARTS MANUAL — REV. #3 (12/07/12) — PAGE 21
TROUBLESHOOTING
Troubleshooting (Pump)
Symptom Possible Problem Solution
Pump Fails To Start
Incorrect voltage/amps?
Check that proper voltage 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.
Check electrical connections?
If using fl oat switches check wiring, inspect
power cord.
Blown power fuse? Replace fuse, check cause of blown fuse.
Impeller locked?
Disconnect power cord and check for clogging
and improper impeller clearance. Unclog pump.
Check overload protection device.
Wet motor windings?
Use multimeter to check motor insulation.
Insulation resistance must be greater than 15
megaohms. If resistance is low, disassemble
pump motor and bake windings to dry them.
Defective motor and pump bearings?
Check for excessive bearing wear. If worn,
replace bearings. Replace motor if defective.
Pump Fails to Deliver Full
Output
Twisted or restricted discharge hose?
Lay hose fl at unkinked. Remove clog from hose
line.
Clogged pump strainer? Clean strainer.
Low voltage?
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 Cord Length and
SizesTable.
Impeller worn? Replace impeller.
Water in Seal Oil
Defective water seal? Replace water seal.
Loose Oil Fill Plug? Tighten securely.