7
POTENTIAL PROBLEMS DURING OPERATION AND SOLUTIONS:
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Symptom:
Possible cause:
Solution to the problem:
The security device against dry run has
been engaged
Wait until the quantity of water in the well
is sufficient so the pump is switched on
automatically.
The security device against over-current
has been engaged
Wait until the motor cools down and
switch on the pump.
Check the cause of the overload. Remove
the cause.
Make sure the electric plug of the pump is
properly inserted in electric socket.
Check the corks at home and all installation
switches which may cut off the power
supply from the network
The pump is not
running
No power supply
Check if power supply is ensured near your
house – the power company may have cut
off power in a larger area.
A break in one wire of the feed cable
Check resistance between the cable wires
The pump keeps
switching on and
off
Incorrect voltage or drop during start-up Check voltage
The filter screen is blocked at suction
Disconnect the pump from electrical supply.
Take the pump out of the well and clean
the filter
Incorrect direction of the motor revolution
(Valid only for 3 phase motor)
Change the two veins of the feed
cable on the feeding strip (only for
three-phase motors)
Too high resistance during the flow
through the delivery pipe (hose).
Check if the permitted lifting height for this
specific type of pump is not exceeded. The
lifting height to be generated by the pump
depends on the level difference between
water table in the well the water is pumped
out and the level at which the water is
pumped, the length of the delivery pipe
(hose) and its diameter. If resistance is too
high for this specific type of pump replace
the pump with a different one, of greater
Sand in the pump (dirty water)
Remove sand from the pump. Clean the
well.
Supply voltage is too low
Check the supply voltage
The pump is
running but is
not feeding
water or is
feeding too little
water
Too little water in the well
Check the pump’s position. The pump’s
fuel feed port should be at least 2 m from
the lowest dynamic level of water table.
Pressure vessel is too small
Replace the vessel with a bigger one
No airbag in the pressure vessel
Check the air pressure in the vessel.
Add if necessary. If the situation repeats
often check if the diaphragm in the vessel
is not broken
The difference between the switching
on and switching off pressure at
pressure switch is too small
Adjust the switch
Frequent switching on
and off the pump
Suspended non-return valve
Take the pump out and replace the valve.
