| CAUSE OF
TROUBLE |
HOW TO CHECK |
HOW TO CORRECT |
| 1. Incorrect line voltage. |
Check line voltage terminals
in control box or connection box if 2-wire model, with voltmeter. Make
sure that voltage is within the minimum-maximum range prescribed by
manufacturer. |
If the voltage is incorrect,
contact the power company to have it corrected. |
2. Defective control box:
a) Defective wiring.(Skip for
2 wire models) |
Check all motor and power-line
wiring in control box, following the wiring diagram found inside box.
Check that all connections are tight and no short circuits exist due to
worn insulation, crossed wires, etc. |
Rewire any incorrect circuits.
Tighten loose connections. Replace worn wires. |
| b) Incorrect components. |
Check all control box
components to insure they are correct type and size specific for your pump
with manufacturer’s literature. Check previous service work to see if
correct components were installed. |
Replace any incorrect
component with the size and type recommended by the manufacturer. |
| c) Defective starting
capacitor (skip for 2-wire models). |
Using an ohmmeter, determine
resistance across starting capacitor. When contact is made, the ohmmeter
needle should jump at once, then move up slowly. No movement indicates an
open capacitor or defective relay points. No resistance means the
capacitor is shorted. |
Replace defective starting
capacitor. |
| d) Defective relay (skip for
2-wire models). |
Using an ohmmeter, check relay
coil. Its resistance should be as shown in the manufacturers literature.
Recheck ohmmeter reading across starting capacitor. A good capacitor and
no needle movement indicates defective relay points. |
If coil resistance is
incorrect or points defective, replace relay. |
| 3. Defective pressure switch. |
Check voltage across pressure
switch points. If less than line voltage determined in “1” above, the
switch points are causing low voltage by imperfect contact. |
Clean points with a mild
abrasive cloth or replace pressure switch. |
| 4. Pump in crooked well. |
Wedged into a crooked well the
motor and pump may become misaligned resulting in a locked rotor. |
Pull pump and straighten well. |
5. Defective motor winding or
cable:
a) Shorted or open motor winding. |
Check resistance of motor
winding by using an ohmmeter on proper terminals in control box (see
manufacturer’s wiring diagram). Resistance should match ohms specified in
manufacture’s data sheet. If too low, motor winding may be shorted; if
high or infinite resistance, check for open circuit in motor winding. |
If the motor winding is
defective - shorted or open - the pump must be pulled and the motor
repaired. |
| b) Grounded cable or wiring. |
Ground one lead of ohmmeter to
drop pipe or shell casing, touch other lead to each motor wire terminal.
If needle moves appreciably there is a good ground in either cable or
motor winding. |
Pull the pump and inspect the
cable for damage. Replace damaged cable. If cable checks OK, the motor
winding is grounded. |
| 6. Pump sand locked. |
Make pump run backwards by
interchanging main and start winding (black and red) motor leads at
control box. |
Pull pump disassemble and
clean. Before replacing make sure sand has settled in well. If well is
chronically sandy and submersible should not be used. |