Faults, causes and remedies

The pump does not start or stops after a short time.

  1. Interrupted mains connection.
  2. Examine electrical connection.
  3. Examine fuses/residual-current device (RCD).
  4. Thermal motor monitoring tripped.
  5. Cool down the pump. The pump starts automatically.
  6. Pump starts and stops too frequently. Examine the inflow quantity.
  7. Fluid temperature is too high. Examine the fluid temperature. Refer to the nameplate for the maximum permitted fluid temperature.
  8. Pump clogged (suction port, impeller).
  9. Clean the pump and the inner part of the pump.
  10. The float switch is not working.
  11. Examine the area around the pump. The float switch must be free to move.

The pump starts but does not pump.

  1. The water level is too low.
  2. Examine the inflow.
  3. The pump runs too long. The water level is below the minimum level. Examine the level measurement.
  4. Pump clogged (suction port, impeller).
  5. Clean the pump and the inner part of the pump.
  6. Discharge line/pressure hose clogged.
  7. Flush the discharge line.
  8. Flush the pressure hose.
  9. Remove kinks in the pressure hose.
  10. Non-return valve clogged.
  11. Clean the non-return valve in the discharge line.
  12. Replace defective non-return valve.
  13. Air in the pump/discharge line.
  14. Submerge the pump at a small angle.
  15. Install an air vent valve in the discharge line.
  16. Drill a 3 mm hole in the discharge pipe above the discharge port

The flow rate decreases while the pump is running.

  1. Discharge line/pressure hose clogged.
  2. Flush the discharge line.
  3. Flush the pressure hose.
  4. Remove kinks in the pressure hose.
  5. Pump clogged (suction port, impeller).
  6. Clean the pump and the inner part of the pump.
  7. Air in the pump/discharge line.
  8. Submerge the pump at a small angle.
  9. Install an air vent valve in the discharge line.
  10. Drill a 3 mm hole in the discharge pipe above the discharge port

Customer service

If the points listed here do not correct the problem, contact customer service for more information. There can be a charge for this service.