Fault Finding Chart - Grundfos SQ Serie Montage- Und Betriebsanleitung

SQE-NE: Only pumps that can be certified as
uncontaminated, i.e. pumps containing no hazardous
and/or toxic material, may be returned to Grundfos
for servicing.
To prevent injury to the health of persons involved
and to the environment, a document certifying that
the pump is clean is required.
Grundfos must receive this certificate before the
product. Otherwise, Grundfos will refuse to accept
the product for servicing.
Possible costs of returning the pump are paid by the
customer.

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
1. The pump does
not run.
2. The pump runs
but gives no
water.
18
Cause
a) The fuses in the electric
installation are blown.
b) The ELCB or the voltage-operated
ELCB has tripped out.
c) No power supply.
d) The motor protection has cut off
the power supply due to overload.
e) The pump/submersible drop cable
is defective.
f) Overvoltage or undervoltage has
occurred.
a) The discharge valve is closed.
b) No water or too low water level in
borehole.
c) The non-return valve is stuck in its
closed position.
d) The suction strainer is choked up.
e) The pump is defective.
Remedy
Replace the blown fuses. If the new ones
blow too, the electric installation and the
submersible drop cable should be
checked.
Cut in the circuit breaker.
Contact the power supply authorities.
Check whether the motor/pump is blocked.
Repair/replace the pump/cable.
Check the power supply.
Open the valve.
See item 3 a).
Pull out the pump and clean or replace the
valve.
Pull out the pump and clean the strainer.
Repair/replace the pump.