8. Fault finding the product
DANGER
Electric shock
Death or serious personal injury
‐ Switch off the power supply before
starting any work on the product.
‐ Make sure that the power supply can-
not 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 conta-
minated if it has been used for a liquid
which is injurious to health or toxic.
‐ Wear personal protective equipment.
8.1 The motor does not start
Cause Remedy
No power supply. Connect the power supply.
The pump was stopped by the float switch. Adjust or replace the float 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 reset the
relay.
The impeller is blocked by impurities. Clean the impeller.
Short circuit in the cable or motor. Replace the defective part.
8.2 The motor protection or thermal relay trips after a short time of operation
Cause Remedy
The liquid temperature is too high. Use another pump type. Contact your local Grundfos
supplier or sales support.
The impeller is blocked or partly blocked by
impurities.
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.
Incorrect direction of rotation. Reverse the direction of rotation.
Related information
4.1 Checking the direction of rotation
8.3
The pump runs constantly or gives too little water
Cause Remedy
The pump is partly blocked by impurities. Clean the pump.
The outlet pipe or valve is partly blocked by
impurities.
Clean the outlet pipe or valve.
The impeller is not properly fixed to the shaft. Tighten the impeller.
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