Grundfos SQE 1-35 96510071 [17/388] Fault finding chart
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Grundfos SQE 1-35 96510071 [17/388] Fault finding chart

Grundfos SQ 3-105 96524448 [17/388] Fault finding chart
English (GB)
17
10. Fault finding chart
Warning
Before starting any work on the pump/
motor, make sure that the power supply
has been switched off and that it cannot be
accidentally switched on.
Fault Cause Remedy
1. The pump does
not run.
a) The fuses in the electric
installation are blown.
Replace the blown fuses. If the new ones
blow too, the electric installation and the
submersible drop cable should be
checked.
b) The ELCB or the voltage-operated
ELCB has tripped out.
Cut in the circuit breaker.
c) No power supply. Contact the power supply authorities.
d) The motor protection has cut off
the power supply due to overload.
Check whether the motor/pump is blocked.
e) The pump/submersible drop cable
is defective.
Repair/replace the pump/cable.
f) Overvoltage or undervoltage has
occurred.
Check the power 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
borehole.
See item 3 a).
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 strainer.
e) The pump is defective. Repair/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 by a smaller
model to obtain a smaller capacity.
b) The valves in the discharge pipe
are partly closed/blocked.
Check and clean/replace the valves,
if necessary.
c) The discharge pipe is partly
choked by impurities (ochre).
Clean/replace the discharge pipe.
d) The non-return valve of the pump
is partly blocked.
Pull out the pump and check/replace the
valve.
e) The pump and the riser pipe are
partly choked by impurities
(ochre).
Pull out the pump. Check and clean or
replace the pump, if necessary. Clean the
pipes.
f) The pump is defective. Repair/replace the pump.
g) Leakage in the pipework. Check and repair the pipework.
h) The riser pipe is defective. Replace the riser pipe.
i) Undervoltage has occurred. Check the power supply.

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