Fault Finding The Product - Grundfos Conlift1 LS Montage- Und Betriebsanleitung

8. 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.
Fault
1. The pump does
not run.
2. Reduced or no
performance.
3. Frequent
starts/stops.
4. Alarm.
10
Cause
a) No power supply.
b) A fuse is blown.
c) The power supply cable is
damaged.
d) The thermal overload switch
has tripped:
– The motor is not sufficiently
cooled.
– Deposits in the pump.
a) Outlet hose squeezed or
broken.
b) The non-return valve does not
open.
c) The motor fan cannot be turned
freely.
a) The non-return valve does not
close.
b) The inlet quantity is too high.
a) The condensate is not pumped
out of the tank.
Remedy
Connect the power supply.
Replace the fuse (1 A slow-blow fuse).
Repair or replace the cable. This must only
be carried out by an authorised service
workshop or by Grundfos.
Clean the cooling slots in the motor cover.
Clean the impeller, pump housing and the
entire lifting station.
Straighten the outlet hose or replace it. The
bending radius of the hose must be at least
60 mm.
Remove the outlet connection, and clean the
non-return valve.
Clean the pump housing and the impeller.
Remove the outlet connection, and clean the
non-return valve.
Make sure the inlet quantity is correct.
See points 1 and 2.