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15
10. Fault finding
Fault Cause Remedy
1. The pump does not run. a) The fuses are blown. Replace the blown fuses. If the new ones blow too,
check the electric installation and the submersible drop
cable.
b) The ELCB or the voltage-operated ELCB
has tripped.
Cut in the circuit breaker.
c) No power supply. Contact the power supply company.
d) The motor-protective circuit breaker has
tripped.
Reset the motor-protective circuit breaker
(automatically or possibly manually).
Check the voltage if it trips again. If the voltage is okay,
see items 1e to 1h.
e) The motor-protective circuit
breaker/contactor is defective.
Replace the motor-protective circuit breaker/contactor.
f) Starter device is defective. Repair or replace the starter device.
g) The control circuit has been interrupted or is
defective.
Check the electric installation.
h) The dry-running protection has cut off the
power supply to the pump due to low water
level.
Check the water level. If it is okay, check the water
level electrodes/level switch.
i) The pump/submersible drop cable is
defective.
Repair or replace the pump/cable.
2. The pump runs but gives
no water.
a) The discharge valve is closed. Open the valve.
b) No water or too low water level in borehole. See item 3a.
c) The non-return valve is stuck in closed
position.
Pull out the pump and clean or replace the valve.
d) The suction strainer is blocked. Pull out the pump and clean the strainer.
e) The pump is defective. Repair or replace the pump.
3. The pump runs at
reduced performance.
a) The drawdown is larger than anticipated. Increase the installation depth of the pump, throttle the
pump or install a pump with a smaller performance.
b) Wrong direction of rotation. See section 6.7.1 Checking the direction of rotation.
c) The valves in the discharge pipe are partly
closed/blocked.
Clean or replace the valves.
d) The discharge pipe is partly blocked by
impurities (ochre).
Clean or replace the pipe.
e) The non-return valve of the pump is partly
blocked.
Pull out the pump and clean or replace the valve.
f) The pump and the riser pipe are partly
blocked by impurities (ochre).
Pull out the pump and clean or replace it.
Clean the pipes.
g) The pump is defective. Repair or replace the pump.
h) Leakage in the pipework. Check and repair the pipework.
i) The riser pipe is defective. Replace the pipe.
4. Frequent starts and
stops.
a) The differential of the pressure switch
between the start and stop pressures is too
small.
Increase the differential. The stop pressure must not
exceed the operating pressure of the pressure tank,
and the start pressure should be high enough to
ensure sufficient water supply.
b) The water level electrodes or level switches
in the reservoir have not been installed
correctly.
Adjust the intervals of the electrodes/level switches to
ensure suitable time between the cutting-in and
cutting-out of the pump. See installation and operating
instructions for the electrodes/level switches. If the
intervals between stop/start cannot be changed via the
automatics, the pump performance may be reduced by
throttling the discharge valve.
c) The non-return valve is leaking or stuck
half-open.
Pull out the pump and clean or replace the valve.
d) The tank precharge pressure is too small. Adjust the tank precharge pressure in accordance with
its installation and operating instructions.
e) The tank is too small. Increase the capacity of the tank by replacing or
supplementing with another tank.
f) The diaphragm of the tank is defective. Check the diaphragm tank.
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