Grundfos CMBE Series User Manual

English (GB)
15
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 cannot
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
1. Pump does
not run.
No lights on. a) Power supply failure. Switch on power supply.
Check cables and cable
connections for defects and
loose connections.
b) Fuses blown. Check cables and cable
connections for defects, and
replace the fuses.
Alarm.
Motor stopped.
Two opposite red
indicator lights flashing
simultaneously.
c) Sensor is defective. Replace sensor.
2. Pump
performance
is unstable.
No lights on. a) Pump inlet pressure too
low.
Check the inlet conditions of
the pump.
b) Inlet pipe is partly
blocked by impurities.
Remove and clean inlet pipe.
c) Leakage in inlet pipe. Remove and repair inlet pipe.
d) Air in inlet pipe or
pump.
Vent the inlet pipe or pump.
Check the inlet conditions of
the pump.
3. Pump has
tried to restart
five times and
is now
stopped.
Alarm.
Motor stopped.
Two opposite red
indicator lights flashing
simultaneously.
a) Pump inlet pressure too
low.
Check the inlet conditions of
the pump.
b) Inlet pipe is partly
blocked by impurities.
Remove and clean inlet pipe.
c) The foot or non-return
valve is blocked in
closed position.
Remove and clean, repair or
replace valve.
d) Leakage in inlet pipe. Remove and repair the inlet
pipe.
e) Air in inlet pipe or
pump.
Vent the inlet pipe or pump.
Check the inlet conditions of
the pump.
4. Pump runs
backwards
when
switched off. No lights on.
a) Leakage in inlet pipe. Remove and repair inlet pipe.
b) Foot or non-return valve
defective.
Remove and clean, repair or
replace valve.
c) Foot valve is blocked in
completely or partly
open position.
Remove and clean, repair or
replace valve.

Grundfos CMBE Series Specifications

General

Brand	Grundfos
Model	CMBE Series
Category	Water Pump
Language	English