Grundfos SEG - The Pump Operates at Below-Standard Performance and the Power Consumption Is Increased; The Pump Operates but Delivers no Liquid; The Pump Is Blocked

Cause Remedy
Wrong electrical connection.
(If the pump is star-connected to a delta connection, it
results in very low undervoltage).
• Check and correct the electrical installation.
9.4 The pump operates at below-standard performance and the power consumption is
increased.
Cause Remedy
The impeller is blocked by impurities.
• Clean the impeller.
The direction of rotation is wrong.
• Check the direction of rotation. If it is incorrect,
interchange two phases in the power cable.
9.5 The pump operates but delivers no liquid.
Cause Remedy
The outlet valve is closed or blocked.
• Check the outlet valve and open or clean it, if
necessary.
The non-return valve is blocked.
• Clean the non-return valve.
There is air in the pump.
• Vent the pump.
9.6 The pump is blocked.
Cause Remedy
The grinder system is worn.
• Replace the grinder system.
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