Grundfos CMBE 3-93 Instrucciones De Instalación Y Operación página 24

11. Fault finding the product
DANGER
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.
11.1 The pump is not running and there is no indicator light
Cause
Power supply failure.
11.2 The pump rotates backwards
No light indication in Grundfos Eye.
Cause
• Foot valve or non-return valve is clogged or
defective.
• Foot valve or non-return valve is locked in an
open position.
11.3 The pump can be reset but runs only for a few seconds
Alarm.
Motor is stopped.
Two opposite red indicator lights flashing simultaneously.
Cause
• The pump inlet pressure is too low.
24
Fault finding and fault correction must be carried
out by qualified persons.
Remedy
• Check if the power supply is switched off. Switch
on the power supply.
• Check if the external motor protection has
tripped.
• Check cables and cable connections for defects
and loose connections.
Remedy
• Remove and clean, repair, or replace the valve
Remedy
• Check the inlet conditions of the pump.