Fault Finding - Grundfos CMBE 1-44 Installation And Operating Instructions Manual

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.
Fault Grundfos Eye
Pump does not No lights on.
run.
Alarm.
Motor stopped.
Two opposite red indica-
tor lights flashing simul-
taneously.
Pump performance No lights on.
is unstable.
18
WARNING
Biological hazard
Death or serious personal injury
‐
When servicing the product, only use
Grundfos original spare parts.
Cause
Power supply failure.
Fuses blown.
Sensor is defective.
Pump inlet pressure too low.
Inlet pipe is partly blocked by
impurities.
Leakage in inlet pipe.
Air in inlet pipe or pump.
Remedy
Switch on power supply.
Check cables and cable connec-
tions for defects and loose con-
nections.
Check cables and cable connec-
tions for defects, and replace the
fuses.
Replace sensor.
Check the inlet conditions of the
pump.
Remove and clean inlet pipe.
Remove and repair inlet pipe.
Vent the inlet pipe or pump.
Check the inlet conditions of the
pump.