Troubleshooting - MULTIQUIP ST2037F Operation And Parts Manual

Symptom
Pump Fails To Start
Pump Fails to Deliver Full
Output
Water in Seal Oil
Pump Fails to Stop
PAGE 18 — ST2037F/2040TF SUBMERSIBLE PUMP • OPERATION AND PARTS MANUAL — REV. #3 (12/14/17)
Troubleshooting (Pump)
Possible Problem
Incorrect voltage/amps?
Malfunction in fl oat switch?
Blown power fuse?
Impeller locked?
Wet motor windings?
Defective motor and pump bearings?
Twisted or restricted discharge hose?
Clogged pump strainer?
Low voltage?
Impeller worn?
Defective water seal?
Loose Oil Fill Plug?
Malfunction in Float Switch?

TROUBLESHOOTING

Solution
Check that proper voltage (115VAC, 60 Hz,
single-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.
Check that the movement of the fl oat switch is
not obstructed. Inspect fl oat switch and power
cord.
Replace fuse. Check cause of blown fuse.
Disconnect power cord and check for clogging.
Unclog pump. Check overload protection
device.
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.
Check for excessive bearing wear. If worn,
replace bearings. Replace motor if defective.
Lay hose fl at unkinked. 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.
Replace impeller.
Replace water seal.
Tighten securely.
Check that the movement of the fl oat switch is
not obstructed.