14
Symptom Cause Remedy
Pump does
not operate
and motor
does not run.
No Electricity
Verify presence of electricity.
Not Plugged in correctly Ensure pump is connected properly
Circuit breaker activated Reset circuit breaker
Pump hums
and the
thermal relays
cut in and out
Pump is clogged by
debris
Clean suction pipe and foot valve/
strainer. Clean the pump by flushing
with water. Remove the priming and
drain plugs. If the pump cannot start
after several flushings, it must be
dismantled and cleaned.
Pump
operates but
delivers no
water.
Pump is not filled with
water.
Fill the pump with water (see
installation section - Priming Pump )
Suction head is too high Reduce the suction head
Foot valve/strainer is not
submerged enough
Make the suction pipe longer (max 8
metres)
Suction pipe is taking
in air
Check the suction pipe and joints for
air leaks.
Suction pipe/strainer or
non-return valves are
clogged with debris
Clean the suction pipe/strainer or
non-return valve
Pump is clogged with
debris
Clean the pump of debris
Reduced
performance
Suction head is too high Reduce suction head.
Foot valve/strainer only
partially submerged
Lengthen suction pipe.
Pump shaft seal is worn
or damaged
Replace defective parts
Pump is partially blocked
with debris
Remove debris and flush pump with
clean water
Should problems persist, contact your nearest Onga Service Agent.
Troubleshooting
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