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Symptom Possible Cause(s) Corrective Action(s)
Motor will not run 1. Power off 1. Turn power on or call power company
2. Fuse is blown (Breaker tripped) 2. Replace fuse (Reset breaker)
3. Wires at pressure switch are
loose, disconnected, or wired
incorrectly
3. Refer to wiring instructions. Check and tighten all wiring Wires
at p
4. Faulty pressure switch 4. Replace switch
5. Motor thermal overload
tripped
5. Let cool. Overload will automatically reset. Provide a shaded,
well ventilated area for pump
switch
Motor runs hot and
overload kicks off
1. Pressure switch is wired
incorrectly
5.
1. Refer to wiring instructions
2. Voltage is too low 2. Check line voltage. Install heavier wiring if wire size is too
small (See Wiring Chart, page 5). Check with power company
3. Rapid cycling 3. Check pressure switch. Ensure tank is not water-logged
4. High surrounding temperature 4. Provide a shaded, well ventilated area for pump
Motor hums but
will not run
1. Motor is wired incorrectly 1. Refer to wiring instructions
2. Voltage is too low 2. Check line voltage. Install heavier wiring if wire size is too
small (See Wiring Chart, page 5). Check with power company
3. Obstructed Impeller 3. Disconnect power. Using a flat head screw driver attempt to
rotate motor shaft (located under plastic cap at rear of motor).
If shaft does not rotate freely remove obstruction from
impeller.
4. Voltage selector switch not
properly set.
4. Set voltage selector switch (Figure 6) to match line voltage.
(See electrical connections page 3)
Motor runs but
little or no water is
delivered.
NOTE: Check prime
before looking
for other causes.
Unscrew priming
plug and see if
water is in priming
hole
1. Pump in new installation did
not pick up prime through:
1. New installation:
a. Improper priming a. Re-prime according to instructions
b. Air leaks b. Check all connections on suction line
c. Leaking foot valve c. Replace foot valve
2. Pump has lost prime through: 2. Existing installations:
a. air leaks a. Check all connections on suction line and shaft seal
b. water level below suction of
pump
b. Lower suction line into water and re-prime. If receding
water level in well exceeds suction lift, a deep well pump is
needed
3. Impeller is obstructed 3. Clean impeller
4. Check valve or foot valve is
stuck in closed position
4. Replace check valve or foot valve
5. Pipes are frozen 5. Thaw pipes. Bury pipe below frost line. Heat pit or pump house
6. Foot valve and/or strainer are
buried in sand or mud
6. Raise foot valve and/or strainer above well bottom
Pump starts and
stops too often
1. Water-logged tank
(Conventional tank)
1. Follow instructions in maintenance section (See page 4)
2. Ruptured diaphragm or
bladder (Pre-charged tank)
2. Replace tank
3. Air volume control connected
to wrong opening on pump
3. Move to correct pump opening
4. Incorrect tank pre-charge (Pre-
charged tank)
4. Add or release air as needed
5. Leak in system or house piping 5. Locate and repair leak
6. Foot valve or check valve stuck
open
6. Replace valve
7. Improperly adjusted pressure
switch
7. Adjust or replace switch
6
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Operating Instructions and Parts Manual JSU50
Troubleshooting Chart