22
1)
Options / model variants
Original instructions
MC 5M - MC 6P - MC 7P
8 Troubleshooting
Fault Cause Remedy
Pressure drop • Air in the system • Vent the system by
operating the spray gun
several times at short
intervals. If necessary,
operate the cleaner for a
short time without the high-
pressure hose connected.
• High pressure nozzle blocked
worn
• Clean/replace the high
pressure nozzle
• Detergent tank empty • Top up detergent tank or
set detergent to “0”
Pressure fl uctuations • Pump draws in air (only
possible in suction mode)
• Check that the suction set
is air-tight
• Lack of water • Open water tap
• Water inlet hose is too long
or its cross-section too small
• Use a water inlet hose
that can provide the water
fl ow (Q
max
) defi ned for the
machine
• Lack of water caused by
blocked water fi lter
• Clean the water fi lter in the
water connection (never
work without water fi lter)
• Lack of water because max.
permissible suction height
has not been heeded
• See instructions
The motor does not start when
the cleaner is switched on
•
•
The plug is not inserted
properly, i.e. there is no
current
Oil level too low
•
•
Check the plug, lead and
switch and if necessary
have them replaced by a
skilled electrician
Check oil/add oil
•
•
The mains fuse is switched
off
The overload protection
has been activated due to
overheating or overloading of
the motor
•
•
Switch on the mains fuse
Check that the mains
voltage and the cleaner
voltage are the same.
Switch off the cleaner and
allow it to cool for at least 3
minutes
When the cleaner is switched
on the motor buzzes without
starting
• The mains voltage is too low
or there is a phase failure.
• Have the electrical
connection checked
• The pump is blocked or
frozen
• Contact the Nilfi sk
customer service
• Incorrect cross-section or
length of the extension lead
• Use lead with correct cross
section or length
The motor switches off • The overload protection
has been activated due to
overheating or overloading of
the motor
• Check that the mains
voltage and the cleaner
voltage are the same.
Switch off the cleaner and
allow it to cool for at least 3
minutes
• High-pressure nozzle is dirty • Change the high-pressure
nozzle
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