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PROBLEM
CHECK
Motor will not start but fuses do not blow
No voltage.
No voltage at control box or disconnect switch.
No voltage at pressure switch.
No voltage at control box.
Cable or splices bad.
Control box incorrectly wired.
Fuses blow or overload protector trips when motor starts
Wrong size fuse or wrong
Check fuse size against chart, Page 2.
size time delay fuse.
Wire size too small.
Check wire size against chart, Page 3.
Starting capacitor defective,
Check control box to see if starting capacitor has blown out.
blown, or wrong size.
Check capacitor rating. Check start relay.
Low or high voltage.
Check that line voltage is within ±10% of nameplate
rated voltage while motor is running.
Power supply wire leads not
Check control box wiring diagram against incoming
correctly connected to
power hookup. Check power supply wire color coding.
control box.
Broken wire in control box.
Examine all connections and wiring in control box.
Pump or motor stuck or
Check for locked shaft in pump.
binding.
Power supply wire splices or
Consult licensed electrician or qualified serviceman.
motor leads grounded,
shorted, or open.
Fuses blow or overload protector trips when motor is running
Low or high voltage.
Check that line voltage is within ±10% of rated nameplate
voltage while motor is running.
High ambient (atmospheric)
Check temperature of control box.
temperature.
Control box with wrong
Compare voltage and horsepower on motor nameplate
voltage or horsepower
with those given on control box nameplate or on circuit
rating.
diagram inside control box cover.
Wire size too small.
Check wire size against chart, Page 3.
Pump starts too frequently
Leaks in system.
Check all tank connections with soapsuds for air leaks.
Check plumbing for leaks.
Pressure switch.
Check for defective switch or switch out of adjustment.
Check valves leaking.
Make sure check valves are not leaking back.
Tank waterlogged.
Pre-charged tanks: check tank pre-charge air pressure,
check for leak in bladder.
Air over water tanks: check for air leaks Check
Air Volume Control (AVC).
Leak in drop pipe.
Raise drop pipe one length at a time until water
stands in pipe.
Pressure switch too far
Measure distance from pressure switch to tank.
from tank.
Little or no water delivered
Check valve stuck
Examine valve.
or installed backwards
(standard tank only).
Low water level.
Determine lowest water level in well while pump is
running and compare to pump depth setting.
Low voltage.
Check voltage at control box with pump running. Check
incoming wire size and power supply wire size against
chart, Page 3.
Plugged intake screen.
Pull pump and check condition of screen.
Check valve at pump
Pull pump and examine check valve.
discharge stuck.
Worn impellers and
Make sure system is clear of obstructions and pump is in
diffusers.
solid water and operating normally.
Air or milky water discharge from faucets
Gas in well water.
Check for presence of gas in well water.
Air volume control not work-
Make sure ports and ball check valves are clear.
ing (standard tanks only).
TROUBLESHOOTING GUIDE
7
CORRECTIVE ACTION
Replace blown fuses.
Replace faulty pressure switch.
Rewire supply to control box.
Consult licensed electrician or serviceman.
Reconnect control box correctly (see Wiring
Installation Diagrams).
Install correct fuse or time delay fuse.
Install correct size wire.
Replace starting capacitor. Replace start relay if
defective.
If voltage variation is greater than ±10%, call power
company or local hydro authority to adjust voltage.
Reconnect leads to match wiring diagram in control
box cover. Reconnect power supply wires so wire 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.
Do not attempt to disassemble pump or motor.
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.
Use only control box designed for use with pump.
Install correct wire size.
System must be air and water tight.
Re-adjust or replace pressure switch.
Replace check valves if necessary.
Pre-charge tanks: adjust air pressure to 2 PSI (13.8 kPa)
less than pump cut-in pressure (when there is no water
pressure on system). Replace bladder if necessary.
Air over water tanks: repair or replace tanks,
replace AVC if necessary.
Replace pipe above that point.
Move switch to within 1' (.3M) of tank.
If stuck, free valve; if installed backwards, reverse it.
Lower pump further into well (but at least 5' (1.5M)
above bottom of well). Throttle pump discharge until
discharge equals recovery rate of well. NOTICE: Running
pump while airlocked can cause loss of prime and
seriously damage pump.
Install larger wire from meter to control box. Install larger
wire from control box to pump. If necessary, have power
company raise supply voltage.
Clean or replace as necessary.
Free check valve.
Replace pump.
Remove bleeder orifices; plug tees. Be sure plugged tees
do not leak. If necessary, separate gas from air before
it enters pressure tank.
Replace control if necessary.
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