Fault Finding - Grundfos Sololift2 D-2 Montage- Und Betriebsanleitung

9. Fault finding

Warning
Remove the fuse, pull out the plug, or switch off the power supply.
Make sure that the power supply cannot be accidentally switched on.
All rotating parts must have stopped moving.
The product must only be serviced by trained service personnel.
See also section 7.3 Service instructions.
Fault
1. Motor does not start
when the level in the
tank reaches the start
level.
2. Motor hums but does
not operate.
3. Motor runs
continuously or at
irregular intervals.
4. Motor runs but does not
evacuate water.
5. The lifting station
evacuates slowly.
6. Rattling noise from the
lifting station, but water
is evacuated.
7. Odour from the tank.
8. Water from shower or
another appliance
connected to the lower
inlets drains off slowly.
Backflow from the
lifting station.
Cause
a) Supply failure.
b) Fuse blown.
If new fuse blows at once,
either cable or motor is faulty.
c) Impeller stuck. Thermal switch
tripped.
d) Pressure switch stuck.
a) Impeller stuck.
b) Motor or capacitor defective.
a) Water leaking from inlet into
tank.
b) Water leaking back into tank
from discharge pipe.
c) Pressure switch defective.
a) Pump or tank blocked.
b) Air lock in pump or vent hole in
pump housing blocked.
c) Discharge port or pipe blocked. Remove blockage.
a) Discharge pipe is too long or
has an excessive number of
bends.
b) The pump housing is leaky.
c) Hydraulics blocked.
a) Foreign body hitting the
impeller.
a) Carbon filter contaminated.
a) Hydraulics blocked.
b) The start level has changed.
c) Inlet pipe diameter is too small. Use a pipe with a larger diameter.
Remedy
Reestablish the power supply.
Replace the fuse.
Measure cable and motor. If 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.
Clean and free the pressure switch.
Free the impeller and check that it can
rotate freely.
Replace the motor or capacitor.
Check for leaking appliances.
Check the non-return flap.
Replace the pressure switch unit.
Remove blockage.
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.
Check the non-return flap.
Increase the discharge pipe size
(maximum 32 mm).
Change pipework to reduce 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.
Check that the motor shaft can rotate
freely. Remove the motor flange to clean
the impeller.
Check the pressure switch.
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