Grundfos SPO 3-40A, Installation And Operating Instructions Manual

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