Fault Finding The Product - Grundfos Sololift2 C-3 Montage- Und Betriebsanleitung

6. Fault finding the product

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.
See also section 5.3 Service
Fault
1. The motor does not
start when the level in
the tank reaches the
start level.
2. The motor hums but
does not operate.
3. The motor runs
continuously or at
irregular intervals.
4. The pump runs but
does not deliver the
rated flow rate.
5. The lifting station
evacuates slowly.
6. Rattling noise from the
lifting station, but water
is evacuated.
7. Odour from the tank.
instructions.
Cause
a) Supply failure.
b) A fuse is blown.
If a new fuse blows at once,
either the cable or motor is
faulty.
c) The impeller is stuck. The
thermal switch has tripped.
d) The float switch is stuck.
a) The impeller is stuck.
b) The motor or capacitor is
defective.
a) Water is leaking from the inlet
into the tank.
b) Water is leaking back into the
tank from the outlet pipe.
c) The float switch is defective or
stuck.
a) The pump or tank is blocked.
b) There is an air pocket in the
pump or the vent hole in the
pump housing is blocked.
c) The outlet port or pipe is
blocked.
a) The outlet pipe is too long or
has an excessive number of
bends.
b) The pump housing is leaky.
c) The hydraulics are blocked.
a) A foreign body is hitting the
impeller.
a) The carbon filter is
contaminated.
Remedy
Reestablish the power supply.
Replace the fuse.
Measure the cable and motor. If the
cable or motor is defective, replace the
defective parts.
Free the impeller, and wait until the
motor is cooled down and the thermal
switch has reset.
Remove the float switch and clean the
pipe.
Free the impeller and check that it can
rotate freely.
Replace the motor or capacitor.
Check for leaking appliances.
Check the non-return flap.
Clean the float switch unit or replace it,
if necessary.
Remove the blockage.
Check operation of the 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.
Remove the blockage.
Check the non-return flap.
Increase the outlet pipe size (maximum
40 mm).
Change pipes to reduce the number of
bends.
Change bends to soft bends.
Replace the pump housing (service
part).
Check that the motor shaft can rotate
freely. Remove the motor flange to clean
the impeller.
Remove the foreign body.
Replace the carbon filter.
9