Troubleshooting - Pentair ONGA IMH750 Owner's Manual

Troubleshooting

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