Grundfos Sololift2 D-2 - Fault finding the product; The motor does not start when the level in the tank reaches the start level.; The motor hums but does not operate.; The pump runs but does not deliver the rated flow rate.

English (GB)
7
7. Fault finding the product
See also section 6.3 Service instructions.
WARNING
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.
Fault Cause Remedy
1. The motor does not
start when the level in
the tank reaches the
start level.
a) Supply failure. Reestablish the power supply.
b) A fuse is blown.
If a new fuse blows at once,
either the cable or motor is
faulty.
Replace the fuse.
Measure the cable and motor. If the
cable or motor is defective, replace the
defective parts.
c) The impeller is stuck. The
thermal switch has tripped.
Free the impeller, and wait until the
motor is cooled down and the thermal
switch has reset.
d) The pressure switch is stuck. Clean and free the pressure switch.
2. The motor hums but
does not operate.
a) The impeller is stuck. Free the impeller and check that it can
rotate freely.
b) The motor or capacitor is
defective.
Replace the motor or capacitor.
3. The motor runs
continuously or at
irregular intervals.
a) Water is leaking from the inlet
into the tank.
Check for leaking appliances.
b) Water is leaking back into the
tank from the outlet pipe.
Check the non-return flap.
c) The pressure switch is
defective.
Replace the pressure switch unit.
4. The pump runs but
does not deliver the
rated flow rate.
a) The pump or tank is blocked. Remove the blockage.
b) There is an air pocket in the
pump or the vent hole in the
pump housing is blocked.
Check operation of vent valve in the
tank.
Check that the carbon filter is not wet.
Check that the vent hole in the pump
housing is not blocked.
c) The outlet port or pipe is
blocked.
Remove the blockage.
Check the non-return flap.
5. The lifting station
evacuates slowly.
a) The outlet pipe is too long or
has an excessive number of
bends.
Increase the outlet pipe size (maximum
32 mm).
Change pipes to reduce the number of
bends.
Change bends to soft bends.
b) The pump housing is leaky. Replace the pump housing (service
part).
c) The hydraulics are blocked. Check that the motor shaft can rotate
freely. Remove the motor flange to clean
the impeller.
6. Rattling noise from the
lifting station, but water
is evacuated.
a) A foreign body is hitting the
impeller.
Remove the foreign body.
7. Odour from the tank. a) The carbon filter is
contaminated.
Replace the carbon filter.