The Performance Is Unstable And There Is A Green Indicator Light; The Pump Is Not Running And The Motor Shows A Red Indicator Light - Grundfos CMBE Serie Notice D'installation Et De Fonctionnement

Cause
• The inlet pipe is partly blocked by impurities.
• The non-return valve is blocked in a closed
position.
• There is a leakage in the inlet pipe.
• There is air in the inlet pipe or pump.

11.4 The performance is unstable and there is a green indicator light

Cause
• The pump inlet pressure is too low.
• The inlet pipe is partly blocked by impurities.
• There is a leakage in the inlet pipe.
• There is air in the inlet pipe.

11.5 The pump is not running and the motor shows a red indicator light

Cause
The motor is overheated.
The sensor is defective.
Cause unknown.
Remedy
• Remove and clean the inlet pipe.
• Inspect, repair, or replace the non-return valve if
necessary.
• Vent the inlet pipe and the pump.
Remedy
• Check the inlet conditions of the pump.
• Remove and clean the inlet pipe.
• Remove and repair the inlet pipe.
• Vent the inlet pipe and the pump.
Remedy
• Check the inlet conditions of the pump.
• Remove and clean the inlet pipe.
• Remove and repair the inlet pipe.
• Vent the inlet pipe and the pump.
• Replace the sensor.
• Contact Grundfos or an authorized service
workshop.
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