English (GB)
10
10. Fault finding
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
Grundfos company or service workshop.
Warning
Before starting fault finding, switch off the
power supply, and make sure that all
rotating parts have stopped moving. Make
sure that the power supply cannot be
accidentally switched on.
Fault Cause Remedy
1. Motor does not start. Fuses
blow, or motor starter trips
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 as they are not
the right type.
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 after a short while.
a) Low setting of thermal relay in
motor starter.
Set the relay in accordance with
the specifications on the
nameplate.
b) Increased current
consumption due to large
voltage drop.
Measure the voltage between
motor phases. Tolerance: ± 10 %.
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.
Check the direction of rotation,
and, if necessary, interchange two
phases. See section 8.1 Direction
of rotation.
b) Wrong direction of rotation.
4. Pump operates, but supplies
no liquid.
a) Discharge valve closed or
blocked.
Check the discharge valve, and
open and/or clean, if necessary.
b) Non-return valve blocked. Clean the non-return valve.
Vent the pump.c) Air in pump.
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