12. Fault finding
WARNING
Electric shock
Death or serious personal injury
‐ Switch off the power supply before you
start any work on the product.
‐ Make sure that the power supply can-
not be switched on accidentally.
WARNING
Pressurised system
Death or serious personal injury
‐ Depressurise the system before you
start any work on the product. The
pumped liquid may be scalding hot and
under high pressure.
‐ Drain the system or close the isolating
valves on either side of the pump.
WARNING
Biological hazard
Death or serious personal injury
‐ When servicing the product, only use
Grundfos original spare parts.
Fault Grundfos Eye Cause Remedy
Pump does not
run.
No lights on. Power supply failure. Switch on power supply.
Check cables and cable connec-
tions for defects and loose con-
nections.
Fuses blown. Check cables and cable connec-
tions for defects, and replace the
fuses.
Alarm.
Motor stopped.
Two opposite red indica-
tor lights flashing simul-
taneously.
Sensor is defective. Replace sensor.
Pump performance
is unstable.
No lights on. Pump inlet pressure too low. Check the inlet conditions of the
pump.
Inlet pipe is partly blocked by
impurities.
Remove and clean inlet pipe.
Leakage in inlet pipe. Remove and repair inlet pipe.
Air in inlet pipe or pump. Vent the inlet pipe or pump.
Check the inlet conditions of the
pump.
18
English (GB)
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