8
8. Fault finding chart
9. Disposal
Disposal of this product or parts of it must be carried out accord-
ing to the following guidelines:
1. Use the local public or private waste collection service.
2. In case such waste collection service does not exist or cannot
handle the materials used in the product, please deliver the
product or any hazardous materials from it to your nearest
GRUNDFOS company or service workshop.
Make sure that the electricity supply has been switched off and that all rotating parts have stopped moving before attempting
to diagnose any fault.
Fault Cause Remedy
1. Motor does not start. Fuses
blow or motor starter trips
out immediately.
Caution: Do not start again!
a) Supply failure; short-circuit; earth-leakage
fault in cable or motor winding.
Have the cable and motor checked and repaired
by a qualified electrician.
b) Fuses blow due to use of wrong type of
fuse.
Install fuses of the correct type.
c) Impeller blocked by impurities. Clean the impeller.
d) Level switch out of adjustment or defective. Check the level switch.
2. Pump operates, but motor
starter trips out after a short
while.
a) Low setting of thermal relay in motor starter. Set the relay in accordance with the specifica-
tions on the pump nameplate.
b) Increased current consumption due to large
voltage drop.
Measure the voltage between two motor
phases.
Tolerance: ±10% (±5% for explosion-proof
pumps).
c) Impeller blocked by impurities. Increased
current consumption in all three phases.
Clean the impeller.
3. Pump operates at below-
standard performance and
power consumption.
a) Impeller blocked by impurities. Clean the impeller.
b) Wrong direction of rotation. Check the direction of rotation and possibly in-
terchange two phases. See section 6.1 Check-
ing of direction of rotation.
4. Pump operates, but gives no
liquid.
a) Discharge valve closed or blocked. Check the discharge valve and open and/or
clean.
b) Non-return valve blocked. Clean the non-return valve.
c) Air in pump. Vent the pump.
5. Pump cycling between start
and stop.
a) Level switch out of adjustment or defective. Check the level switch.
Subject to alterations.
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