Troubleshooting Guide - Pentair ONGA 112 Series Owner's Manual

Troubleshooting Guide

Symptom
Pump failure or reduced
capacity or reduced
discharge pressure.
Thermal Overload tripping:
The thermal overload is
automatic and resets after
the pump has cooled.
If thermal continues to trip
there is something wrong
with the pump.
Cause
Suction leaks / lost prime
Clogged pipe / impeller,
worn impeller.
No power at outlet.
Blown fuse.
Incorrectly sized pipe.
Motor burnt out due to
voltage spike or flooded by
water.
Valves turned to the closed
position.
Air ingress to system.
Remedy
Pump must be primed; make
sure that the pump casing is
full of water. Refer priming
instructions.
Make sure there are no leaks
in suction piping.
Make sure suction pipe inlet
is well below the water level
to prevent pump from
sucking air.
Suction lift of 3 to 6 metres
will reduce performance.
Suction lift of more than 6
metres will prevent pumping
and cause pump to lose
prime. In either instance,
move the pump closer
(vertically) to water source.
Ensure the suction pipe
diameter is large enough.
Make sure that the impeller
is not clogged. This should
be checked by qualified
personnel only.
Impeller and diffuser may be
worn. If so, check with your
local Onga dealer or suitably
qualified personnel.
Pump may be trying to push
too high a column of water. If
so, a "higher head" pump is
required.
Use another electrical
appliance that is known to
work to check the power
outlet.
Check fuse and replace if
necessary.
Check pipe work pressure
losses and replace with
larger diameter pipe if
required.
The motor may need
replacing.
Check the plumbing to
ensure the valves are in the
correct position for pumping
on the suction and
discharge.
Prime the pump. Check that
there are no air leaks in the
suction piping or fittings.
Check that there are no leaks
coming from beneath the
pump.
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