Fault Finding The Product - Grundfos Conlift1 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.
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 should 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.
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