Fault Finding; Pump Is Not Running - Grundfos CMBE Montage- Und Betriebsanleitung

11. 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.

11.1 Pump is not running

Pump is not running.
No lights on Grundfos Eye.
Cause
Power supply failure.
Fuses blown.
2) Available as accessory for CMBE TWIN.
20
Remedy
1. Switch on the power
supply.
2. Check cables and
cable connections for
defects and loose
connections.
3. Check if the external
motor protection has
tripped.
1. Check cables and
cable connections for
defects.
2. Replace the fuses.
11.2 Pump is not running
Pump is not running.
Two opposite red indicator lights flashing
simultaneously, which indicates an alarm. The motor
is stopped.
Cause
Sensor is defective.
The pump inlet pressure
is too low.
The inlet pipe is partly
blocked by impurities.
The non-return valve is
blocked in closed
position.
There is air in the inlet
pipe or pump.
The inlet pressure
2)
switch is defective.
Remedy
• Replace sensor.
• Check the inlet
conditions of the pump.
• Remove and clean the
inlet pipe.
• Inspect, repair or
replace the non-return
valve if necessary.
• Vent the inlet pipe and
the pump.
• Replace the inlet
pressure switch.