12
Troubleshooting Guide (Continued)
Symptom Cause Remedy
Low voltage. Check voltage at motor
terminals and at meter while
pump is running – this check
should be performed by a
qualified electrician only. If
voltage is low check for
loose connections or consult
your power company.
Pump running too slowly.
Pump may be too hot. Check line voltage; if less
than 90% or more than
110% of rated voltage
consult a licensed
electrician.
Increase ventilation. Reduce
ambient temperature.
Tighten any loose
connections.
Pump leaking from between
the casing and motor.
Casing bolts are not
tightened sufficiently; Casing
O’ring is worn; Mechanical
seal requires replacing.
Switch off the power to the
pump. Loosen the casing
bolts. Check the alignment
and condition of the casing
o’ring before retightening the
bolts. Replace the o’ring if
leaking persists.
Replace the mechanical seal.
Pump not running. Check power supply. No water.
Gate valve closed. Open gate valve.
Foot valve leaking. Check foot valve for seal, fix
or replace if necessary.
Air lock. Check suction line for
‘humps’. Have your local
pump professional prime the
pump with an engine drive
pump to score air from lines.
Pump will not prime.
Water source has been
drawn down so that suction
is above the water line.
Check suction is submerged.
Should problems persist, contact your nearest Onga service agent.
Pump runs but no water. Air leak in suction pipe. Check suction pipe.
The pump has not been
filled with water.
Water has evaporated leaving
the pump dry.
Foreign matter has clogged
the impeller.
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