16
8Failures
8.1 Failure table
WARNING
Take the general safety measures for the installation, maintenance and repair into
consideration.
Problem Possible cause Possible solution Checkpoints
The pump will not start No voltage on the termi-
nal clamps
Check the power supply
• Circuit
• Main switch
• Hand-0-Aut switch
• Fuses
Check the motor safety
relay
• Earth leakage switch
• Protective relay
• Motor temperature
• Water feeler (option)
Check the start signal
• Medium level
• Level switching
• Start-stop change
• Switch box
Motor failures Check the motor
• Insulation test
• Phase resistance
The pump does not stop No stop signal Check level switching • Level switching
• Switch box
Air in the pump housing Temporarily remove the
pump from the coupling
Pump switching level
The pump starts and stops
quickly after each other
Incorrect start/stop signal Check the level switches
• Level switching
• Adjusting switches
Power supply is unstable Check the power supply • Circuit
• Undervoltage
• 3-phase available?
• Adjustment of the
motor protection
• Fuses
Pump current is too high Current failure Check the power supply
• Fuses
• Undervoltage
Pump failure Check the pump
• Impeller blockage
• Viscosity of the
medium
The direction of rotation is
incorrect
Reverse the direction of
rotation
The capacity is too high Increase the counterpres-
sure
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