Nilfisk-Advance MC 6P Service Manual page 36

Fault
When the cleaner is switched
on the motor buzzes without
starting.
The motor switches off.
Cleaner starts / stops by itself.
No detergents drawn in.
Working pressure too low.
Working pressure too low and
loud noise comming from
pump .
SM_MC_6P Ver.2.0_2021
Troubleshooting
Cause
− 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.
− The overload protection has
been activated due to
overheating or overloading
of the motor.
− High pressure nozzle is
dirty.
− Leakage on high pressure
side.
− Injector is dirty or suction
hose is blocked.
− Detergent container empty.
− The cap on the nozzle is
not set at low pressure.
- Suction - and pressure
valves leaking.
- Piston U-sleves in pump
worn.
- Piston stocked in pump.
Remedy
• Have the electrical
connections checked.
• Pump needs service
(see part "F").
• Use lead with correct cross
section and length.
• 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.
• Locate the leak and repair
it. (See next page).
• Clean.
• Top up/change the
container.
• Turn cap of the
FlexoPower nozzle towards
"CHEM" up to the stop.
• Replace parts.
• Check pump for dama-
ged parts — demount
and reassemble pump
housing with the right
E
General failures
36