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11. Disposing of the product
This product or parts of it must be disposed of in an
environmentally sound way:
1. Use the public or private waste collection service.
2. If this is not possible, contact the nearest
Grundfos company or service workshop.
3. See also end-of-life information at
www.grundfos.com/product-recycling.
5. Pump runs but
gives no liquid or
pump performance
is not constant.
a) Pump strainer partly blocked by
impurities.
Clean the strainer.
b) Liquid level in tank too low. Increase the liquid level.
c) Pump draws in air. Check the inlet conditions.
6. Leakage in shaft
seal.
a) Shaft seal is defective.
Replace the shaft seal.
7. Noise. a) Cavitation. Check the inlet conditions.
b) Pump does not rotate freely (frictional
resistance) because of incorrect
pump shaft position.
Adjust the pump shaft.
c) Frequency converter operation. See section Motors supplied by
Grundfos.
Fault Cause Remedy
1. Motor does not run
when started.
a) Power supply failure. Connect the power supply.
b) Fuses are blown. Replace fuses.
c) Motor-protective circuit breaker has
tripped.
Reactivate the motor-protective
circuit breaker.
d) Thermal protection has tripped. Reactivate the thermal protection.
e) Main contacts in motor-protective
circuit breaker are not making contact
or the coil is faulty.
Replace contacts or magnetic coil.
f) Control circuit is defective. Repair the control circuit.
g) Motor is defective. Replace the motor.
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