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10. Fault finding
10.1 Grundfos Eye operating status
10.2 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.
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.
Grundfos Eye Indication Cause
No lights on.
Power off.
Pump not running.
Two opposite green indicator lights running in the
direction of rotation of the pump.
Power on.
Pump running.
Two opposite red indicator lights flashing
simultaneously.
Alarm.
Pump stopped.
Fault
Automatic reset and
restart?
Corrective actions
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.
Yes
Check the system for defective non-return valves and replace,
if necessary.
Check the system for correct position of non-return valves,
etc.
Supply voltage to the pump too low. Yes Check that the power supply is within the specified range.
The pump is blocked. No
Dismantle the pump, and remove any foreign matter or
impurities preventing the pump from rotating.
No water at the pump inlet or the water
contains too much air.
No
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.
Internal fault in the pump electronics. Yes
Replace the pump, or call GRUNDFOS SERVICE for
assistance.
Supply voltage to the pump too high. Yes Check that the power supply is within the specified range.
If the power supply cable is damaged, it must be replaced by the manufacturer, the manufacturer’s service partner or
a similarly qualified person.
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