Grundfos ALPHA2 Pumps

This fault indicates that the internal rotor of the pump is blocked and unable to turn. This prevents the pump from circulating liquid in your system.

The pump is detecting that the electrical voltage being supplied to it is too low. This can prevent the pump from starting or operating correctly.

This indicates an internal electrical problem within the pump's motor or its control system. It signifies a hardware failure or malfunction.

The pump is operating without sufficient liquid, meaning it is trying to pump air instead of water. Running dry can cause significant damage to the pump over time.