Grundfos CMBE - Inlet Pressure Protection

11.1 The pump is not running and there is no indicator
light
Cause
TM053827
Power supply failure.
Remedy
• Check if the power supply is switched off. Switch on the
power supply.
• Check if the external motor protection has tripped.
• Check cables and cable connections for defects and loose
connections.
11.2 The pump rotates backwards
No light indication in Grundfos Eye.
TM053827
Cause
• Foot valve or non-return valve is clogged or defective.
• Foot valve or non-return valve is locked in an open position.
Remedy
• Remove and clean, repair, or replace the valve
11.3 The pump can be reset but runs only for a few
seconds
Alarm.
Motor is stopped.
Two opposite red indicator lights flashing simultaneously.
TM053839
Cause
• The pump inlet pressure is too low.
• 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.
Remedy
• Check the inlet conditions of the pump.
• Remove and clean the inlet pipe.
• Inspect, repair, or replace the non-return valve if necessary.
• Vent the inlet pipe and the pump.
11.4
The performance is unstable and there is a green
indicator light
TM053831
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.
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.
11.5 The pump is not running and the motor shows a
red indicator light
TM053839
Cause
The motor is overheated.
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.
Cause
The sensor is defective.
Remedy
• Replace the sensor.
Cause
Cause unknown.
Remedy
• Contact Grundfos or an authorized service workshop.
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English (US)