Nilfisk-ALTO POSEIDON 4 Series, Service Manual, Page: 17 / 37

E
Troubleshooting
SM_POSEIDON 4_en_Ver.1.0_08.2012 17
Fault Cause Remedy
When the cleaner is switched
on the motor buzzes without
starting.

The main voltage is too low
or there is a phase failure
(3 ph model).

The pump is blocked or
frozen.

Incorrect cross-section or
lenght of the extension lead.

Have the electrical
connections checked.

Pump needs service
(see part ”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 for at least
3 minutes.

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 is dirty or suction
hose is blocked.

Detergent container empty.

The cap on the nozzle is
not set at low pressure.

Clean.

Top up/change the
container.

Turn cap of the
FlexoPower nozzle towards
”CHEM” up to the stop.