10
10. Fault finding chart
11. Disposal
This product or parts of it must be disposed of in an
environmentally sound way:
1. Use the public or private waste collection service.
2. If this is not possible, contact the nearest Grund-
fos company or service workshop.
Before starting work on the pump, make sure that the electricity supply has been switched off and
that it cannot be accidentally switched on.
Fault
Cause
Remedy
1. Motor does not run
when started.
a) Supply failure.
Connect the electricity supply.
b) Fuses are blown.
Replace fuses.
c) Motor starter overload has tripped out.
Reactivate the motor protection.
d) Main contacts in motor starter are not
making contact or the coil is faulty.
Replace contacts or magnetic coil.
e) Control circuit is defective.
Repair the control circuit.
f)
Motor is defective.
Replace the motor.
2. Motor starter
overload trips out
immediately when
supply is switched
on.
a) One fuse/automatic circuit breaker is
blown.
Cut in the fuse.
b) Contacts in motor starter overload are
faulty.
Replace motor starter contacts.
c) Cable connection is loose or faulty.
Fasten or replace the cable connec-
tion.
d) Motor winding is defective.
Replace the motor.
e) Pump mechanically blocked.
Remove the mechanical blocking of
the pump.
f)
Overload setting is too low.
Set the motor starter correctly.
3. Motor starter
overload trips out
occasionally.
a) Overload setting is too low.
Set the motor starter correctly.
b) Low voltage at peak times.
Check the electricity supply.
4. Motor starter has
not tripped out but
the pump does not
run.
a) Check 1 a), b), d) and e).
5. Pump runs but
gives no liquid or
pump capacity is
not constant.
a) Pump strainer partly blocked by
impurities.
Clean the strainer.
b) Liquid level in tank too low.
Increase the liquid level.
c) Pump rotates in the wrong direction.
Change the direction of rotation of the
motor.
Subject to alterations.
