English (GB)
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8. Fault finding chart
9. Disposal
Disposal of this product or parts of it must be carried
out according to the following guidelines:
1. Use the local public or private waste collection
service.
2. In case such waste collection service does not
exist or cannot handle the materials used in the
product, please deliver the product or any
hazardous materials from it to your nearest
Grundfos company or service workshop.
Fault Cause Remedy
1. Motor does not
start.
a) No electricity supply. Connect the electricity supply.
b) Motor switched off by level switch. Adjust/replace the level switch.
c) Fuses are blown. Replace fuses.
d) Motor protection/thermal relay has
tripped out.
Wait until the motor protection trips in
again/reset the relay.
e) Impeller blocked by impurities. Clean the impeller.
f) Short-circuit in cable or motor. Replace the defective part.
2. Motor protection/
thermal relay
trips out after
short time of
operation.
a) Temperature of pumped liquid too high. Use another pump type.
b) Impeller blocked or partly blocked by
impurities.
Clean the pump.
c) Phase failure. Call an electrician.
d) Voltage too low. Call an electrician.
e) Overload setting of the motor starter too
low.
Adjust the setting.
f) Incorrect direction of rotation.
See section 4.1 Checking of direction of
rotation.
Reverse the direction of rotation.
3. Pump runs
constantly or
gives
insufficient water.
a) Pump partly blocked by impurities. Clean the pump.
b) Discharge pipe or valve partly blocked
by impurities.
Clean the discharge pipe.
c) Impeller not properly fixed to the shaft. Tighten the impeller.
d) Incorrect direction of rotation.
See section 4.1 Checking of direction of
rotation.
Reverse the direction of rotation.
e) Incorrect setting of level switch. Adjust the level switch.
f) Pump too small for the application. Replace the pump.
g) Impeller worn. Replace the impeller.
4. Pump runs but
gives no water.
a) Pump blocked by impurities. Clean the pump.
b) Discharge pipe or non-return valve
blocked by impurities.
Clean the discharge pipe.
c) Impeller not properly fixed to the shaft. Tighten the impeller.
d) Air in pump. Vent the pump and the discharge
pipe.
e) Liquid level too low. The suction strainer
is not completely submerged in the
pumped liquid.
Submerge the pump in the liquid or
adjust the level switch.
f) Level switch does not move freely. Make the level switch move freely.
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