Cause Remedy
Incorrect direction of rotation. Reverse the direction of rotation.
Incorrect setting of the float switch. Adjust the float switch.
The pump is too small for the application. Replace the pump.
The impeller is worn. Replace the impeller.
Related information
4.1 Checking the direction of rotation
8.4 The pump runs but gives no water.
Cause Remedy
The pump is blocked by impurities. Clean the pump.
The outlet pipe or valve is blocked by impurities. Clean the outlet pipe or valve.
The impeller is not properly fixed to the shaft. Tighten the impeller.
There is air in the pump. Vent the pump and the outlet pipe.
The liquid level is too low. The inlet strainer is not
completely submerged in the pumped liquid.
Submerge the pump in the liquid or adjust the level
switch.
Pumps with float switch: The float switch does not
move freely.
Adjust the float switch.
Related information
3.2.5 Adjusting the float switch cable length
15
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