12
14. Troubleshooting
Fault Cause
Remedy
1. The pump does
not run.
a) The fuses are blown.
Replace the blown fuses. If the new fuses
blow too, check the electrical installation
and the drop cable.
b) The GFI circuit breaker has tripped.
Reset the circuit breaker.
c) No electricity supply.
Contact the electricity provider.
d) The motor protection has cut off the
electricity supply due to overload.
Check for motor/pump blockage.
e) The drop cable is defective.
Repair or replace the pump/cable.
f) Overvoltage has occurred.
Check the electricity supply.
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
well.
Increase the installation depth of the pump,
throttle the pump or replace it with a
smaller capacity model.
c) The check valve is stuck in its closed
position.
Pull the pump and clean or replace the
valve.
d) The suction strainer is closed.
Pull the pump and clean the strainer.
e) The pump is defective.
Repair or replace the pump.
3. The pump runs at
reduced capacity.
a) The drawdown is larger than
anticipated.
Increase the installation depth of the pump,
throttle the pump or replace it with a
smaller capacity model.
b) The valves in the discharge pipe are
partly closed/blocked.
Check and clean or replace the valves as
necessary.
c) The discharge pipe is partly choked
by impurities (iron bacteria).
Clean or replace the discharge pipe.
d) The check valve of the pump is
blocked.
Pull the pump and clean or replace the
valve.
e) The pump and the riser pipe are
partly choked by impurities
(iron bacteria).
Pull the pump. Check and clean or replace
the pump, if necessary. Clean the pipes.
f) The pump is defective.
Repair or replace the pump.
g) Hole in discharge pipe.
Check and repair the piping.
h) The riser pipe is defective.
Replace the riser pipe.
i) Undervoltage has occurred.
Check the electricity supply.
4. Frequent starts
and stops.
a) The differential of the pressure
switch between the start and stop
pressures is too small.
Increase the differential. However, 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 automatic devices used. If the
intervals between start/stop cannot be
changed via the automatics, the pump
capacity may be reduced by throttling the
discharge valve.
c) The check valve is leaking or stuck
half-open.
Pull the pump and clean or replace the
check valve.
d) The supply voltage is unstable.
Check the electricity supply.
e) The motor temperature is too high.
Check the water temperature.
