Nilfisk-ALTO MC 3C, Service Manual

Page: 41 / 71

E
Troubleshooting
SM MC 3C_ MC 4M Ver.1.0_March 2015
41
Fault Cause Remedy
When the cleaner is switched
on the motor buzzer without
starting.

The main voltage is too low
or there is a phase failure
(3 phase model).

The pump is blocked or
frozen.

Incorrect cross-section or
length of the extension lead.

Have the electrical
connections checked.

Pump needs service
(see section ”F”).

Use lead with correct cross
section and length.
The motor switches off.

The overload protection has
been activated due to
overheating or overloading
of the motor.

High pressure nozzle is
dirty.

Check that the main voltage
and the cleaner voltage are
the same.
Switch off the cleaner and
allow it to cool down.

Clean or change the high
pressure nozzle.
Cleaner starts / stops by itself.

Leakage on high pressure
side.

Locate the leak and repair
it.
No detergents drawn in.

Injector in foam sprayer is
dirty or suction hose is
blocked.

Detergent container empty.

Clean.

Top up/change the
container.