Fault Finding Chart - Grundfos SPO Series Installation And Operating Instructions Manual

10. Fault finding chart

Fault
1. The pump does
not run.
2. The pump runs but
gives no water.
3. The pump runs at
reduced capacity.
10
Cause
a) The fuses in the electric installation
are blown.
b) The ELCB or the voltage-operated
ELCB has tripped out.
c) No electricity supply.
d) The motor protection has cut off
the electricity supply due to over-
load.
e) The pump/supply cable is defec-
tive.
f) The float switch is in dry-running
position.
g) The pump is blocked.
a) The discharge valve is closed.
b) No water or too low water level in
well.
c) The non-return valve is stuck in its
closed position.
d) The suction strainer is choked up.
e) The pump is defective.
f) The pump has not been primed
(pump with base plate).
a) The drawdown is larger than antici-
pated.
b) The valves in the discharge pipe
are partly closed/blocked.
c) The discharge pipe is partly
blocked by impurities.
d) The non-return valve in the dis-
charge pipe is partly blocked.
e) The pump and discharge pipe are
partly blocked by impurities.
f) The pump is defective.
g) Leakage in the pipework.
h) The discharge pipe is defective.
i) Undervoltage has occurred.
Remedy
Replace the fuses. If the new ones blow
too, the electric installation and the supply
cable should be checked.
Cut in the circuit breaker.
Contact the electricity supply authorities.
Check whether the motor/pump is blocked.
Repair or replace the pump/cable.
Check the water level and the float switch
for free movability.
Check and clean the pump.
Open the valve.
Increase the installation depth of the pump
(maximum 20 metres). Reduce the pump
performance or replace the pump by a
smaller model to obtain a smaller capacity.
Pull out the pump and clean or replace the
valve.
Pull out the pump and clean the suction
strainer and the impeller, if necessary, see
section 9.1 Cleaning the pump suction
strainer.
Repair or replace the pump.
Prime the pump, see section 7. Start-up.
Increase the installation depth of the pump
(maximum 20 metres). Reduce the pump
performance or replace the pump by a
smaller model to obtain a smaller capacity.
Check and clean or replace the valves, if
necessary.
Clean or replace the discharge pipe.
Clean or replace the valve.
Pull out the pump. Check and clean or re-
place the pump, if necessary. Clean the
pipes.
Repair or replace the pump.
Check and repair the pipework.
Replace the discharge pipe.
Check the electricity supply.