7. Fault finding the product
DANGER
Electric shock
Death or serious personal injury
‐
Before starting any work on the product, make sure
that the power supply has been switched off and that it
cannot be accidentally switched on.
CAUTION
Sharp element
Minor or moderate personal injury
‐
Wear personal protective equipment.
CAUTION
Toxic material
Minor or moderate personal injury
‐
The product will be classified as contaminated if it has
been used for a liquid which is injurious to health or
toxic.
‐
Wear personal protective equipment.
Fault
Cause
Remedy
The motor does not start.
No power supply.
Connect the power supply.
The pump was stopped by the level switch.
UNILIFT KP-A: Adjust or replace the level switch.
The fuses have blown.
Replace the fuses.
The motor protection or thermal relay has tripped.
Wait until the motor protection trips in again or re-
set the relay.
The impeller is blocked by impurities.
Clean the impeller.
Short circuit in the cable or motor.
Replace the defective part.
The motor protection or thermal re-
lay trips after a short time of opera-
tion.
The liquid temperature is too high.
The pump starts automatically after sufficient cool-
ing. If not, use another pump type. Contact your lo-
cal Grundfos supplier or sales support.
The impeller is blocked or partly blocked by impuri-
ties.
Clean the pump.
Phase failure.
Call an electrician.
Too low voltage.
Call an electrician.
The overload setting of the motor-protective circuit
breaker is too low.
Adjust the setting.
The pump runs constantly or gives
too little water.
The pump is partly blocked by impurities.
Clean the pump.
The outlet pipe or valve is partly blocked by impuri-
ties.
Clean the outlet pipe or valve.
The impeller is not properly fixed to the shaft.
Tighten the impeller.
Incorrect direction of rotation. See section Check-
ing the direction of rotation.
Reverse the direction of rotation.
Incorrect setting of the level switch.
Adjust the level switch.
The pump is too small for the application.
Replace the pump.
The impeller is worn.
Replace the impeller.
The pump runs but gives no water.
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 pump inlet 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. See section Start and stop
levels.
Related information
3.2.5 Start and stop levels
3.3.1 Checking the direction of rotation
16
English (GB)
Summary of Contents for Unilift KP 150
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