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Troubleshooting
Problem
Motor will not start but fuses do not blow.
No voltage.
Fuses blow or overload protector trips when motor starts.
Wrong size fuse or
wrong size time delay
fuse.
Wire size too small.
Starting capacitor
defective or blown.
Low or high voltage.
Cable leads not
correctly connected to
control box.
Broken wire in control
box.
Pump or motor stuck or
binding.
Fuses blow or overload protector trips when motor is running.
Low or high voltage.
High ambient
(atmospheric
temperature).
Control box with wrong
voltage or horsepower
rating.
Wire size too small.
Cable splices or motor
leads grounded,
shorted, or open.
Check
No voltage at fuse box.
No voltage at control box.
No voltage at pressure switch.
No voltage on load side of pressure
switch.
Cable or splices bad.
Control box incorrectly wired.
Check fuse size against Fuse Size
tables.
Check wire size against Cable Sizing
tables.
Check control box to see if starting
capacitor has blown out.
Check that line voltage is within
±10% of nameplate rated voltage
while motor is running.
Check control box wiring diagram
against incoming power hookup.
Check drop cable color coding.
Examine all connections and wiring in
control box.
Check for locked rotor in pump.
Check that line voltage is within
±10% of rated nameplate voltage
while motor is running.
Check temperature of control box.
Compare voltage and horsepower on
motor nameplate with those given on
control box nameplate or on circuit
diagram inside control box cover.
Check wire size against Cable Sizing
tables.
Consult licensed electrician or
qualified serviceman.
Corrective Action
Consult power supplier, check generator.
Check connections, rewire from fuse box
to control box.
Check connections, replace control box,
rewire from control box to pressure switch.
Check connections, replace pressure
switch.
Consult serviceman or licensed electrician.
Reconnect control box correctly (see
Installation).
Install correct fuse or time delay fuse.
Install correct size wire.
Replace starting capacitor.
If voltage variation is greater than ±10%,
call power company to adjust voltage.
Reconnect leads to match wiring diagram
in control box cover.
Reconnect drop cable so cable color code
matches motor lead color code.
Disconnect power and repair or replace
faulty wire.
If necessary, pull pump (make all possible
above ground checks first). If pump is
locked, replace it. Clean well of all sand or
lime before reinstalling pump.
If voltage variation is more than ±10%, call
power company to adjust voltage.
Do not mount control box in direct
sunlight.
Replace control box if numbers do not
match.
Install correct wire size.
Do not attempt to disassemble pump or
motor.
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