107144382 E (04. 2017)
MH 4M - MH 5M
MH 6P - MH 7P
Operating
instructions
Original instruction2
1 Symbols used to mark instructions
WARNING & Safety instructions in these operating instructions which must be ob-
served to prevent risks to persons are marked with this danger symbol. Please note
the warning signs placed on the machine.
Before starting up your high- pressure washer for the first time, instructions must be
read through carefully. Save all the instructions for later use. Instructions contains:
Part 1: Safety instructions. Part 2: Instructions for use.
This symbol marks safety instructions related to connection of the machine to water
mains.
Do not inhale fumes.
Rebounding object.
Hot surface.
Steam.
Electrical components.
Dangerous voltage.
The jet must not be directed at persons, animals, live electrical equipment or the
cleaner itself. Do not direct the jet towards yourself or towards other persons in order
to clean clothes or footwear.
2 Safety instructions. For your own safety
WARNING! The high pressure washer may only be used by persons instructed in its
use and who have been expressly authorised to do so
• This appliance is not intended for use by persons with reduced physical, sensory or mental
capabilities or lack of experience and knowledge, unless they have been given supervision or
instruction concerning use of the appliance by a person responsible for their safety
• Machines shall not be used or maintained by children. Children should be supervised to en-
sure they do not play with the appliance
• Use of this machine is subject to the applicable local safety regulations and proper use.
Please refer to Opera ting Instructions for recommended use, maintenance and problem solving
• Never spray electrical equipment with water: danger for persons, risk of short-circuiting
150°C
Original instruction 3
• Never detach the high pressure hose while the machine is in operation.
HOT WATER: Danger of scalding! Never dismount high-pressure hoses at water tempera-
tures above 50°C.
• High temperature on the lance and hose after hot water use.
150°C
IMPORTANT: Prior to dismounting of the high-pressure hose, the machine should be
cooled down. After cooling down, stop the machine and close the shut-off cock. Then activate
the trigger of the spray handle to relieve the high-pressure hose of pressure.
• Beware of hot water and steam discharge up to 150°C when operating in steam stage.
• After use of the hot water/steam function the high-pressure cleaner must be flushed with cold
water for about 1 min. High temperature on the lance and hose after hot water use.
3 Before starting the cleaner DO READ INSTRUCTIONS FOR USE BEFORE USE!
Before use, check that the machine is safe and in proper condition and in upright posi-
tion on a plain and stable ground to ensure stability. Regularly check whether the power cord is
damaged or shows signs of ageing.
WARNING! Do not use the machine if a supply cord or important parts of the ma-
chine are damaged, e.g. safety devices, high pressure hoses , spray handle or lance
• Check the rated voltage of the machine before connecting it to the mains power supply. En-
sure that the voltage shown on the rating plate corresponds to the voltage of the local mains
power supply.
• For safety reasons, hoses, spray lances and other accessories should always be thawed prior
to use. MIN: 2°C/ 36°F.
NOTE: If your 3-phase cleaner was supplied without a plug, have it fitted with a suitable
3-phase plug with earth conductor.
WARNING! Before use of water jet, assure that the high pressure hose
with the spray handle is safely connected by an audible click to the lance
• High-pressure water jets can be dangerous if misused. The jet must not be directed at per-
sons, animals, live electrical equipment or the cleaner itself
• Do not direct the jet towards yourself or towards other persons in order to clean clothes or
footwear
• Do not use the cleaner when other people without appropriate protective clothing are in the
working area. Wear appropriate protective clothing, safety gloves, boots, hearing aids and hel-
mets with visor and eye protection
• When operating the spray handle, kickback forces are produced at the spraying device and
when the spray lance is held at an angle, a torque is also created. The spray handle and spray
lance must therefore be held firmly with both hands
• Check that cleaning will not result in dangerous substances (e.g. asbestos, oil) being washed
off the object to be cleaned and harming the environment
• During use of high pressure cleaners, aerosols may be formed. Inhalation of aerosols can be
hazardous to health. The employer shall perform a risk assessment in order to specify the nec-
essary protective measures regarding aerosols, depending on the surface to be cleaned and its
environment. Respiratory masks of class FFP 2, an equivalent or higher are suitable for the
protection against hydrous aerosols.
Original instruction4
• This machine has been designed for use with the cleaning agent supplied or recommended
by the manufacturer. The use of other cleaning agents or chemicals may adversely affect the
safety of the machine
• Risk of explosion – Do not spray flammable liquids. Do not clean delicate parts made of rub-
ber, fabric, etc. with the jet nozzle. Keep some distance between the jet nozzle and surface in
order to prevent the surface from damage
Combustion engine powered machines: Do not use combustion engine powered machines
indoors unless adequate ventilation is assessed by national labour authorities.
• Ensure that any exhaust emissions are not in the vicinity of air intakes
• Incorrect fuels shall not be used as they may prove hazardous.
• Do not operate belt-driven units without attached belt cover
• The machine must not be used in flammable or explosive environments. When using the ma-
chine, it must stand at least 1 m from buildings, etc.
4 Transport
For safe transport in and on vehicles we recommend to prevent the equipment from sliding and
tilting by fixing it with belts. For transport and storage at temperatures around or below 0°C,
anti-freeze should be drawn into the pump beforehand (Please refer to Operating Instructions).
5 Water connection
If the machine don´t have a watertank, the machine is only allowed to be connected
with the potable water mains, when an appropriate backflow preventer has been installed, Type
BA, according to EN 60335-2-79. The backflow preventer can be ordered thought Gerni Ser-
vicecenter. The length of the hose between the backflow preventer and the machine must be at
least 12 meters (min diameter 3/4 inch) to absorb possible pressure peaks. Operation by suc-
tion (for example from a rainwater vessel) is carried out without backflow preventer. The suction
set can be ordered thought Gerni Servicecenter.
WARNING! Water that has flowed through backflow preventer and high pressure washer
is considered to be non-potable.
6 Electrical connection
The connection of the electrical supply must be performed by an qualified electrician
and comply with IEC 60364-1. The earth wire must be connected to correct potential and it is
recommended that the electric supply to this machine should include either a residual current
device or another device that will protect the user against indirect contact. The electrical instal-
lation to the machine must be according to local regulations.
WARNING! Inadequate extension cords can be dangerous. If an extension cord is used, it
shall be suitable for outdoor use, and the connection plug has to be kept dry and off the ground.
It is recommended that this is accomplished by means of a cord reel, which keeps the socket at
least 60mm above the ground. Always unwind cord from the reels completely to prevent the
power cord overheating. Disconnect the power cord from the power source by pulling the plug
only (do not pull or tug the power cord).
Original instruction 5
7 Safety devices
• Thermal sensor: A thermal sensor protects the motor against overloading. The machine will
restart after a few minutes when the thermal sensor has cooled.
• Locking device on spray handle: The spray handle features a locking device. When the
pawl is activated, the spray handle cannot be operated.
HOT WATER: • Safety valve: Unacceptably high pressure is fed back without residual pres-
sure via a bypass line into the intake line of the pump when the safety device is tripped. The
safety valve is set and sealed at the factory and must not be adjusted.
• EXH thermal sensor: A thermal is mounted in the exhaust pipe, if the temperature exceeds
a pre-set temperature value, the heat function stops and a manual reset is needed.
8 Maintenance and repair
WARNING! Always switch off the mains disconnecting switch when leaving the machine
unattended
• Always remove the plug from the mains plug socket before carrying out maintenance work or
cleaning of the machine.
Combustion engine powered machines: NOTE! Before cleaning and maintenance of the
high pressure washer, always remove the spark plug cable.
Carry out only the maintenance operations described in the operating instructions. To ensure
machine safety, use only original Gerni spare parts. Do not make any technical modifications
to the high-pressure washer. Ensure that the machine is regularly serviced by authorized Gerni
dealers in accordance with the maintenance plan. Failure to do so will invalidate the warranty.
CAUTION! High-pressure hoses, fittings and couplings are important for the safety of the
cleaner. Use only high-pressure spare parts approved by Gerni!
• If the supply cord is damaged, it must be replaced by the manufacturer, its service agent or
similarly qualified persons to prevent hazards.
6
A
A4
A6
A5
A7
A18
A24
A20
A19
A22
A21
A20
A25
A23
A26
A8
A9
A10
A1
A2
A3
A11
A12
A13
A15
A14
A16
A17
7
A
B
B1
B3
4 X
B2
A27 A33
A38
A28 A34
A39
A29 A35
A40
A30 A36
A32A31
A37
°F
°C
CUT OUT
150
°F
210
80
85
300
°C
175
105
120
60
140
70
160
90
195
100
30
40
50
0
4 4
3 3
2 2
1 1
BA
8888
8
B
B5
B4.a
A
B4.b
B
B
B
A
B6
9
B
C
B7 B9B8
C1.a
C1.b
C
✔
✔
✔
BA
C1.c
10
C
D
E
C2
D1
10°
10°
0°C/32°F
40°C/104°F
D3
E1
D4
E2
?
D2
A
E3
✔
✔
✔
BCAC
{
{
D5
11
E
E4
MAX
MAX
E7
E9
E5
E6
E8 A
B
°F
°C
✔
A
CUT OUT
150
°F
210
80
85
300
°C
175
105
120
60
140
70
160
90
195
100
30
40
50
12
E
E10.a
E10.b
Max 100°C/210°F
Max 32 bar
E10.c
A
CUT OUT
150
°F
210
80
85
300
°C
175
105
120
60
140
70
160
90
195
100
30
40
50
CUT OUT
150
°F
210
80
85
300
°C
175
105
120
60
140
70
160
90
195
100
30
40
50
A
MIN
13
E
E11
MAX
MIN
E12
E12.b
E12.c
E13
F
F1 F2 F3
0
4 4
3 3
2 2
1 1
0
4 4
3 3
2 2
1 1
0
4 4
3 3
2 2
1 1
40°C
✔
A
A
A
A
B
B
B
B
14
F
G
F4
G1 C
BC
G2
F7
F5 F6
0°C/32°F
15
H
H2
H4
H3
H1.a
H1.b
AA
A
A
BB
B
BC
16
H
H5 H6ABC
MIN
✔
C
1)
Optional accessories / Option depending on model
Original instruction
17
Operating instructions
This high pressure washer has been designed for professional
use typically in following cleaning applications:
Agriculture, industry, transport industry, automotive cleaning,
municipal facilities, cleaning trade, construction industry, food
industry etc.
The pictorial quick reference guide
The pictorial quick reference guide is designed for helping you
when starting up, operating and storing the unit. The guide is
subdivided into 8 sections.
A
Before starting
DO READ SAFETY INSTRUCTIONS BEFORE USE!
Operating elements:
A1. Top cover release
A2. Receptacle for service crane and lifting ring
1)
A3. Hot chimney
A4. Cable hook
A5. High pressure hose reel lock
1)
A6. Spray lance
A7. Supply water connection
A8. Water inlet filter
1)
A9. Tunable cable hook
A10. Parking brake
A11. Tool box
A12. Control panel
A13. High pressure hose connection on machine B4.a/B4.b
1)
A14. High pressure hose reel
1)
A15. Crank handle for High pressure hose reel
1)
A16. Place for canister for detergent
A17. Footboard for tipping product
A18. Tank filler for Nilfisk AntiStone
A19. High pressure hose hook
A20. Side door release
A21. Safety warning label
A22. Tank filler for fuel
A23. Spray Gun holder
A24. Flow regulation knob
1)
A25. Fuel level view
A26. Long detergent hose for external canister
A27. Service interval due/expired LED
A28. Nilfisk AntiStone low
1)
LED
A29. Fuel low
1)
LED
A30. Pump oil low1) LED
A31. Power ON LED
A32. Fahrenheit /Celsius indicator
1)
A33. Boiler overheated indication LED
A34. No flame indication LED
A35. ECO-mode indication LED
A36. Hour counter; Set temp. reading; Error codes
1)
A37. Pressure gauge
1)
A38. Main switch with hot/cold water selection
A39. Temperature control knob
A40. Detergent metering knob
1)
B
Unpacking and preparing the unit
B1. Remove safety traps from the cleaner.
B2. Remove the hose, lance and cable from the pallet.
B3. If wanted the hose reel can be changed from right hand
operation to left hand operation
1)
.
B4.a Machines with hose reel: Remove transportation caps
from inlet and outlet. Connect the high pressure hose and
roll it up on the hose reel and lock hose reel on handle
(A)
1)
.
B4.b Machines without hose reel: Remove transportation caps
from inlet and outlet. Connect the high pressure hose and
place it on the hook (B).
B5. Place power cord around cable hooks (A and B) and lock
the cable end at cable hook (B).
B6. The Nilfisk Antiscale device is set at the factory to a water
hardness of Slightly Hard. See table at maintenance
section.
B7. Release the wheel brake.
B8. Lift in the handle and pull the cleaner’s rear wheel of the
pallet and down to the floor.
B9. For easy tilting and maneuvering - kick the footboard and
push down on handle.
C
Lifting and strapping for transport
C1.a The safest way to lift the cleaner is to use a fork-lift truck
from the front or back end of the cleaner. (Not from side!).
C1.b Use the fixing points (A,B,C) when lifting with belts.
Do not lift in or strap to the plastic parts of machine as it
could become detached from the frame.
C1.c For safe daily lifting the GERNI accessory lifting set
(#107140912 + #301001090) is recommended.
C2. Use the fixing points (A,B,C) when securing with belts for
transportation.
Do not lift in or strap to the plastic parts of machine as it
could become detached from the frame.
D
Setting up the unit:
If your location is higher than 500 m (1625 ft) above sea level,
your burner may require re-adjustment for proper performance
and best fuel economy - Contact GERNI Service for assistance!
For location higher than 1000-2500 m might require an optional
burner kit - Contact GERNI Service for assistance!
Before using the cleaner for the first time, check it carefully to
detect any faults or damage. Run the machine only when it is in
perfect condition.
D1. The slope on which the high pressure cleaner is placed
must not exceed more than 10° in any direction.
OBS: ambient temperature should be above 0°C and not
higher than 40°C.
D2. Set the brake.
D3. Fill up detergent tank
1)
.
D4. Fill up tank for Nilfisk AntiStone
1)
.
D5. Fill fuel tank with fresh fuel, heating oil, DIN 51603-1
(without bio diesel). Diesel according to EN 590 (up to 7%
bio diesel) can be used in above 0°C ambient with the
following restrictions: Maximum storage time in high pres-
sure cleaner diesel tank: 1 month. Diesel of more than 6
months old is not allowed to be used. Diesel EN 590 from
an open container must not be used.
See fuel level (A) through window under the filling point.
E
Switching on the unit
OBS: The machine may be protected with antifreeze liquid from
the factory
1)
- take care of point E8 below.
E1. Connect the water supply.
E2. Check if safety label has icon
, then a back flow
preventer is required.
1)
Optional accessories / Option depending on model
Original instruction
18
E3. Turn cable hook and pull off the cable.
E4. Unwind hose and cable to full length before use.
E5. Connect to power supply.
E6. Switching on the cleaner. Cold water operation.
E7. Set Fahrenheit /Celsius: (A) by on/off switch in cold mode
and (B) toggle the temperature control to max
1)
.
E8. Release safety lock and ventilate the machine for air by
activating the spray gun.
If antifreeze is in machine – catch the first 5 liters of fluid
discharge in a container for re-use.
When the water flow is even, continue with the following
steps.
E9. Connect the spray lance to the spray gun.
E10.a Cold water mode setting.
Switch on the cleaner to
.
Flow regulation is adjusted at pump handle (A).
E10.b Hot water mode (up to 100°C)
Select temperature, ECO-mode setting for optimal
standard cleaning.
Switch on the cleaner to
.
Flow regulation is adjusted at pump handle (A).
E10.c Steam mode
1)
(over 100°C)
Turn the flow regulation
1)
(A) completely right to end stop
(OBS: max. 32 bar by temperatures over 100°C!).
Select temperature above 100°C.
Switch on the cleaner to
.
E11. Pressure regulation on FlexoPower or Tornado Lance
1)
.
E12.a Suction from internal detergent canister.
Set the desired concentration of (A) or (B) cleaning agent
at the dosing knob
1)
.
E12.b Suction from external detergent canister:
Pull out the hose (B) from the chassis and connect to can-
ister. Set the desired concentration of (B) cleaning agent
at the dosing knob
1)
.
E12.c Suction from 25 L canister: (only for none hose reel ver-
sion). Cut out the marked area with a knife to open the
strapping points. Strap canister to the back of the ma-
chine. Pull out the hose (B) from the chassis and connect
to canister.
E13. Using cleaning agents: Set the desired concentration of
(A) or (B) cleaning agent at the dosing knob
1)
.
Spray the object. Allow the cleaning agent to work, de-
pending on the degree of soiling. Then rinse off with the
high pressure spray jet. Never allow cleaning agent to dry
out on the object as the surface may be damaged.
F
After using the unit or before leaving it unattended
F1. Switch to cold mode.
F2. Run in cold mode to cool down product.
F3. Switch off the cleaner. Turn the switch to position „OFF“.
F4. Disconnect supply lines.
F5. Close water tap.
F6. Squeeze the spray gun to release pressure.
F7. Lock the safety catch on the spray gun.
G
G1. Storing the cleaner below 0°C:
Remove the water inlet hose from the cleaner. Remove
the spray lance. Switch on the cleaner with the main
switch in position “Cold Water”. Operate the spray gun.
Gradually pour antifreeze (approx. 5 liters) into the water
tank (C). The machine is protected against frost when
antifreeze solution emerges from the spray gun. Lock the
safety catch on the spray gun. Switch off the cleaner. To
avoid any risks, store the cleaner temporarily in a heated
room before using it again. When the machine is put into
service again, the antifreeze solution can be collected and
stored for future use.
G2. Tilt and unscrew the filter glass
1)
and empty it from water
and fill it up with antifreeze and replace it on the cleaner
again.
H
Maintenance & trouble shooting
H1.a Water inlet - Finger filter
1)
: Unscrew quick coupling. Re-
move lock and filter and clean with water.
H1.b Water inlet – Large filter
1)
: Tilt glas outward, unscrew glass
and clean with water.
H2. Fuel filling filter: Filter can be removed by fingers and
rinsed with clean fuel.
H3. Fuel filter: Open side door for access (A). Open hose clips
and replace the fuel filter (B). Observe applicable disposal
regulations. Contact GERNI for sparepart filter.
H4. Fuel Tank: Remove the drain plug and let the fuel pour
into an empty container. Flush with clean fuel. Observe
applicable disposal regulations.
H5. Pump oil: Check the pump oil quality: Check colour of
pump oil. If the oil has a dark grey or white shade, contact
GERNI service!
Top up cold pump with fresh oil to MAX if necessary.
H6. Flame sensor
1)
: Remove the sensor and clean with a soft
cloth. Ensure that the sensor is correctly seated when
installing again - the symbols must face upwards.
EU Declaration of conformity
We,
Nilfisk A/S
Kornmarksvej 1
DK-2605 Broendby
DENMARK
Hereby declare that the
Products: HPW - Professional – Mobile Hot
Description: 230V, 400-460V, 1~, 3~, 50 Hz, IPX5
Type: MH 3M, MH 4M, MH 5M, MH 6P, MH 7P
Are in compliance with the following standards:
EN 60335-1:2012+A11:2014
EN 60335-2-79:2012
EN 55014-1:2006+A1:2009+A2:2011
EN 55014-2:2015
EN 61000-3-2:2014
EN 61000-3-11:2000
Following the provisions of:
Machinery Directive 2006/42/EC
EMC Directive 2014/30/EC
Noise Emission Directive 2000/14/EC – Conformity assessment
procedure according to Annex V.
- Measured noise level: 72-76 dB(A);
- Guaranteed noise level: 88-92 dB(A)
Hadsund, 28-09-2016
Anton Sørensen
Senior Vice President, Global R&D
1)
Optional accessories / Option depending on model
Original instruction
19
B6. Antiscale adjustment
1. Open cabinet (A).
Measure the water hardness or ask your water supply company.
2. Adjustment knob (B) setting
according to rated water flow
mg/l Grains °dH °e °f ppm Ca Description 9-15
L/min
16-20
L/min
21-26
L/min
27-33
L/min
.0-17 0-1
0-7 0-8,8 0-12,5 0-50
Soft 0 0 0 0
17-60 1,1-3,5 Slightly Hard 0,5 1 2 2
60-128 3,6-7,5 7-14 8,8-17,5 12,5-25,1 51-150 Moderately Hard 1 1,5 2,5 3
128-180 7,6-10,5 14-21 17,5-26,3 25,1-37,6 151-300 Hard 1,5 2 3 3,5
>180 >10,5 >21 >26,3 >37,6 >300 Very Hard 2 3 3,5 4
Indications on Display
Indication lights Display Cause Remedy
Constant
0024
- The appliance is ready for operation.
- At power on to cold mode, hour coun-
ter is shown for a few seconds.
Flashing
- Water tap closed or water shortage.
- Detergent tank empty.
- Pressure regulation on the safety con-
trol blocks or the VarioPress
1)
lance is
set to low water volume.
- Machine scaled.
- Check water supply.
- Refill detergent or set Detergent knop to “0“.
- Change setting on safety control block / Vario-
Press to allow full water flow.
- Contact dealer/service dpt.
Flashing
FLO - Machine has run for more than 120s
without propper water supply. Machine
shuts down to avoid pump over-
heating.
- Restart machine, if fault continues
- Contact dealer/service dpt.
Constant
FUE - Low fuel level.
- Cold water operation possible.
- Check fuel level and refill, error reset after 5
sec.
Constant
- Low Nilfisk AntiStone level
1)
.
- Machine is still operational.
- Check Nilfisk AntiStone level and refill.
Constant Constant
- Service interval has expired.
- Machine is still operational.
- Contact dealer/service dpt.
Constant Flashing
- Service interval due in 20 hours.
- Machine is still operational.
- Contact dealer/service dpt.
Constant
HOS - Boiler overheated. Exhaust sensor
(EXT-H) has cut off fuel supply.
- Machine scaled.
- Boiler not serviced.
- Cold water operation is possible.
- Contact dealer/service dpt.
Constant Constant
LHE - Flame sensor (B7) is sooted.
- Ignition or fuel system failure.
- Cold water operation is possible.
- Clean flame sensor (B7).
- Contact dealer/service dpt.
Flashing Flashing
LHL - Boiler is over sootet and needs
service.
- Boiler is filled with diesel.
- Contact dealer/service dpt.
Constant Constant
HOP - Motor is overheated. - Turn main switch to “OFF” position - let the
machine cool down.
- Remove/disconnect extension cable.
- Possible phase failure.
- Have electrical connection checked.
- Contact dealer/service dpt.
Constant Flashing
Flashing
SEC
SEO
- Temperature sensor shorted.
- Temperature sensor is disconnected.
- Cold water operation is possible.
- Contact dealer/service dpt.
Constant Constant
FLF - Flow sensor fault. - Contact dealer/service dpt.
Constant
POL - Low pump oil.
- MPU is leaking oil.
-Check oil lever and refill.
- Contact dealer/service dpt.
1)
Optional accessories / Option depending on model
Original instruction
20
Maintenance plan
Weekly As required After the first 50 operating
hours
When service lamp lights
Water filters
●
Check and clean tank inlet fuel filter
●
Check and replace Internal fuel filter
●
Clean the fuel tank
●
Grease quick couplings nipples for hose,
gun and lance
●
Check the pump oil quality
●
Change the pump oil - Contact dealer/service dpt. - Contact dealer/service dpt.
Other Faults
Indication lights Cause Remedy
Not ON
- Plug not connected to the electrical plug socket. - Put the plug into the electrical socket.
- Check fuse (see chapter Technical Data).
Pressure too low - High pressure nozzle worn out.
- Pressure regulation set to low pressure or
VarioPress-lance
1)
set to low water volume
1)
.
- Replace nozzle.
- Turn the twist grip on safety control block clock-
wise (+) or set VarioPress- lance
1)
to higher
water volume (see chapter E10-11).
Machine is running with
pulsating pressure and makes
knocking noise
- Pump has drawn in air as the detergent tank is
empty
- Close detergent valve. Remove lance from gun.
Operate spray gun and let machine run until
air in pump is gone and the machine is running
normally again.
No detergent drawn in - Detergent tank empty.
- Dirt in detergent tank.
- Suction valve at cleaning agent inlet soiled.
- Top up detergent tank.
- Clean detergent tank.
- Remove suction valve and clean or replace.
Burner soots up - Fuel contamination.
- Burner sooted or adjustment incorrect.
- Contact dealer/service dpt.
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