PROBLEM POSSIBLE CAUSES
Pump will not prime. • Not enough water. Stop motor, remove pressure gauge bushing, and ll case and suction
line with water.
• Pump wired incorrectly.
• Plugged venturi tube or nozzle.
• Foot valve is sitting in sand or mud, or is stuck shut, or leaks.
• Low well water level. In deep wells, the ejector as well as the foot valve must be below
water level.
• For the ACE5C and ACE10C, the diffuser O-ring seal may be improperly positioned.
• Air leaks. Check all connections for airtightness.
Pump delivers water for a period
of time, then stops pumping.
• Low well water level. Use a water-level tester while pump is operating.
• Plugged venturi tube, nozzle, or impeller parts.
• In deep wells, the regulator may be set incorrectly.
Pump does not deliver rated
capacity.
• Plugged venturi or nozzle.
• Faulty pressure gauge resulting in false readings.
• In deep wells, the operating pressure may be too high.
• Low well water level. Use a water-level tester while pump is operating.
• For the ACE5C and ACE10C, the diffuser O-ring seal may be improperly positioned.
• Oversubmergence of ejector. In deep wells, if ejector is more than 10 feet below pumping
level, pumping capacity is reduced.
• In deep wells, the ejector may have improper size and depth setting.
Motor overheats and shuts off
(overload).
• Motor voltage does not match power supply voltage. See page 3.
• Improper wire size. See Wire Size Guide on page 3.
• Impeller is rubbing against pump case.
Pump delivers water but will not
shut off.
• Impeller is worn.
• Defective pressure switch.
• For the ACE5C and ACE10C, the O-ring seal may be improperly positioned.
• Tank precharge pressure too high. Tank precharge pressure must be two pounds less than
switch turn-on setting.
• In deep wells, the water level may be going below limit of ejector. Use water-level tester
while pump is operating.
Pressure switch turns on and off
every few seconds.
• Storage tank is waterlogged—add air.
• Leaky foot valve.
• Too much tank pressure.
• Bladder/diaphragm in pre-charged tank may be ruptured.
Motor fails or does not operate
properly.
• If within Warranty, return pump/motor unit to place of purchase (with proof of purchase)
for exchange.
Troubleshooting 10
TROUBLESHOOTING CHECKLIST (CAUTION: SHUT OFF POWER TO PUMP)
DRAINING FOR SERVICING OR FOR WINTER
The pump should be drained before it is disconnected for
servicing or if it is in danger of freezing. To drain:
• Remove drain plug from bottom of pump case.
• Remove discharge tee to vent the pump.
• Drain all piping to a point 3 feet (1 meter) below
ground level.
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