16
9. Fault finding chart
Note: Components must only be replaced by a qualified person.
Before starting the fault finding, the electricity supply must be switched off. It must be ensured that
the electricity supply cannot be accidentally switched on.
Work on electrical systems and components must only be carried out by a qualified electrician.
Fault Cause Remedy
1. The pump does
not run.
a) No electricity supply. Switch on the electricity supply.
b) Fuse is blown. Check the electrical connection.
Fuse too small.
- Check the performance data.
Replace the fuse.
c) Supply cable damaged. The cable must be repaired or replaced by an
authorized service workshop or by Grundfos.
d) Thermal switch cut out. The motor is not sufficiently cooled.
- The cooling slots in the motor cover are
covered or clogged.
Deposits in the pump part.
- Clean the impeller, pump housing and entire
lifting station.
The condensate is not discharged through the
discharge hose.
- See fault, point 2.
Pump does not start and stop according to
S3 operation.
- See section 10. Technical data.
2. Lower or no
performance.
a) Discharge hose squeezed
or broken.
Check the discharge hose.
The bending radius of the hose must be at least
60 mm.
b) The non-return valve does
not open.
Remove the discharge stub, and clean ball and
seal.
c) The motor fan cannot rotate
freely.
Clean the pump housing and impeller.
3. Frequent starts
and stops.
a) Non-return valve does not
close properly.
Remove the discharge stub, and clean ball and
seal.
Replace the radial seal (pos. 14), if required.
b) The inlet quantity is too
large.
Check the inlet quantity.
4. Alarm. a) The condensate is not
pumped out of the tank.
See faults, points 2. and 3.
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