Fault Finding Chart; Service; Disposal; Non-Return Valve - Grundfos Unilift CC 5 Installation And Operating Instructions Manual

10. Fault finding chart

Before starting work on the pump, make sure that the electricity supply to the pump has been
switched off and that it cannot be accidentally switched on.
Fault Cause
1. The pump does a) Electricity supply switched off.
not run.
b) Fuses in installation blown.
c) The pump thermal switch has tripped
2. The pump stops a) The pumped liquid temperature is
after short time of
operation (ther-
mal switch
b) Pump partly blocked by impurities or
tripped out).
c) Water level too low when the pump is
3. The pump runs a) Pump partly blocked by impurities.
but gives
b) Discharge pipe/hose partly blocked by
insufficient water.
c) Impeller, bottom part or diaphragm
4. The pump runs a) Pump blocked by impurities.
but gives no
b) Non-return valve in discharge pipe/
water.
c) Pumps with float switch: The pump
5. The pump leaks a) Pump sucks air or water with a high air
at the handle
(no fault).

11. Service

It is possible to replace these parts:
Service kit
Impeller

Non-return valve

Adapter for discharge
port

Suction strainer

The parts can be ordered from your pump supplier.
If other pump components are damaged or defective,
contact your pump supplier.
Note: The cable and the float switch must be
replaced by an authorised Grundfos service work-
shop.
out, see section 7.5.
(See also point 2.)
higher than that stated in section 5.
The motor is overheated.
blocked.
started. The pump cannot self-prime,
see sections 7.1 and 7.4.
impurities. The hose may be sharply
bent.
defective.
hose blocked in closed position or
blocked by impurities. The hose may
be sharply bent.
does not stop because the free cable
length of the float switch is too long.
content. See section 7.1.
Type Part number
CC 5 96578967
CC 7 96578968
CC 9 96578969
96578978
96578979
96578990
Remedy
Switch on the electricity supply.
Replace defective fuses.
The thermal switch restarts the pump
when the motor has cooled to normal
temperature.
The pump starts automatically after
sufficient cooling.
Clean the pump, see section 8.1.
Move the pump to a position with higher
water level or add water until the pump
starts sucking.
Clean the pump, see section 8.1.
Check and clean the non-return valve, if
fitted.
Replace defective parts, see section 11.
Clean the pump, see section 8.1.
Check the non-return valve. Clean or
replace the valve, if necessary.
Reduce the free cable length, see section
6.4.
The pump is not damaged. Move the
pump to a place where the water level is
higher.

12. Disposal

This product or parts of it must be disposed of in an
environmentally sound way:
1. Use the public or private waste collection service.
2. If this is not possible, contact the nearest
Grundfos company or service workshop.
Subject to alterations.
11