9
10
7. Troubleshooting
Problem
The motor will not run, no
water is pumped
Possible cause
1) No power supply
2) Motor protection
tripped
3) Defective capacitor
4) Pump blocked
Suggested Solution
1) Check voltage at the
supply, and check that
the plug is connected
securley
2) Wait for internal
protection to reset.
3) Replace the capacitor.
4) Unblock the pump.
The motor runs, but no
water is pumped.
1) The pump is not
submerged.
2) The suction strainer is
blocked.
3) The check valve is
blocked
1) Check that the liquid
level has not dropped
below the minimum
level.
2) Clean the suction
strainer.
3) Clean or replace the
valve
The pump stops after
running for a short period
of time (Thermal over-
load)
1) The power supply is
unsuitable.
2) Solids are blocking the
pump.
3) The liquid is too thick.
1) Check the supply
voltage.
2) Have the pump
disassembled and
cleaned by an
authorised dealer.
3) See your dealer for an
alternate pump.
6. Service & Maintenance
Under normal conditions DOMINATOR submersible pumps do not require any
maintenance. In order to avoid possible failures, it is advisable to periodically check
the pressure supplied and the current absorption. A decrease in pressure is a
symptom of wear. An increase in current absorption is a sign of abnormal
mechanical friction in the pump and/or motor.
If the submersible pump is not going to be used for long periods of time it should be
emptied completely, rinced with clean water and stored in a dry place.
Cleaning the fi lter
If the water supply is not perfectly clean, it may be nessary to clean the strainer with a
steel brush to scrape the dirt accumulated on the external surface. It is also
possible to clean the internal section of the strainer.
Loosen the screw that fi xes the strainer to the body of the electropump and remove it.
Scrape the dirt with a steel brush and rince it with clean water.
Always use origional service parts as supplied and recommended by Onga.
Failure to do so may void warranty.
Do not operate the unit without the inlet strainer
Pumping water containing solids will reduce the life of the pump,
and may affect warranty
If this is not suffi cent, have the hydraulic parts cleaned by an authorised service
center.
Pumping chemicals or agricultural products voids warranty.
Do not pump hydrocarbons with this pump.
If the pump is not going to be used for a long period, it should be completely
emptied, rinsed with clean, fresh water, and stored in a dry place.
