Grundfos ALPHA CS - Alarms

12.10 Alarms
12.10.1 Code 51 (Blocked motor)
Grundfos mini Eye is flashing red, the displays show error code E1 and the pump stops.
Cause Remedy
The pump is blocked. Only a qualified specialist must perform such work.
1. Isolate the pump.
2. Remove the pump head.
3. Remove the deposits.
12.10.2 Code 40 (Undervoltage)
Grundfos mini Eye is flashing red, the displays show error code E2 and the pump stops.
Cause Remedy
The supply voltage to the pump is too low. • Make sure that the power supply is within the
specified range.
12.10.3 Code 29 (Forced pumping)
Grundfos mini Eye is flashing red, the displays show error code E3 and the pump stops.
Cause Remedy
Other pumps or sources generate flow through
the pump even if the pump is switched off.
• Switch off the pump at the main switch. If the
light in the pump display is on, the pump is
running in forced pumping mode.
• Check the system for the correct position of the
non-return valves.
• Check the system for defective non-return valves
and replace the valves if necessary.
12.10.4 Code 74 (Overvoltage)
Grundfos mini Eye is flashing red, the displays show error code E3 and the pump stops.
Cause
Remedy
The supply voltage to the pump is too high. • Make sure that the power supply is within the
specified range.
12.10.5 Code 72 (Internal fault)
Grundfos mini Eye is flashing red, the displays show error code E3 and the pump stops.
Cause
Remedy
Internal fault. • Replace the pump and dispose in an
environmentally sound way according to local
regulations, or contact Grundfos Service.
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English (US)