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10. Fault finding
Warning
Before starting fault finding, switch off the power
supply for at least five minutes. Make sure that the
power supply cannot be accidentally switched on.
Fault
Possible cause
Remedy
The system has stopped and
cannot restart.
Primary sensor is defective.
Replace the sensor.
Transmitters with 0-20 mA or 4-20 mA output
signals are monitored by the system.
Cable is broken or short-circuited.
Repair or replace the cable.
Power supply is disconnected.
Connect the power supply.
CU 352 is defective.
Contact Grundfos.
Power supply is disconnected.
Connect the power supply.
Main switch is switched off.
Switch on the main switch.
Main switch is defective.
Replace the main switch.
Motor protection is activated.
Contact Grundfos.