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12. Fault finding
Warning
Before dismantling the pump, drain the system or close the isolating valve on either side of the pump.
The pumped liquid may be scalding hot and under high pressure.
12.1 Grundfos Eye operating status
Grundfos Eye
12.2 Resetting of fault indications
A fault indication can be reset in one of the following ways:
•
When the fault cause has been eliminated, the pump will revert to normal duty.
•
If the fault disappears by itself, the fault indication will automatically be reset.
Fault
Other pumps or sources force flow through
the pump even if the pump is stopped.
There will be light in the display even if the
power supply has been switched off.
Supply voltage to the pump too low.
The pump is blocked.
No water at the pump inlet or the water
contains too much air.
Internal fault in the pump electronics.
Supply voltage to the pump too high.
If the power supply cable is damaged, it must be replaced by the manufacturer, the manufacturer's service partner or
Caution
a similarly qualified person.
20
Indication
No lights on.
Two opposite green indicator lights running in the
direction of rotation of the pump.
Two opposite red indicator lights flashing
simultaneously.
Automatic reset and
restart?
Yes
Yes
No
No
Yes
Yes
Cause
Power off.
Pump not running.
Power on.
Pump running.
Alarm.
Pump stopped.
Corrective actions
Check the system for defective non-return valves and replace,
if necessary.
Check the system for correct position of non-return valves,
etc.
Check that the power supply is within the specified range.
Dismantle the pump, and remove any foreign matter or
impurities preventing the pump from rotating.
Prime and vent the pump before a new start-up. Check that
the pump is operating correctly. If not, replace the pump, or
call GRUNDFOS SERVICE for assistance.
Replace the pump, or call GRUNDFOS SERVICE for
assistance.
Check that the power supply is within the specified range.
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