13
7 Troubleshooting
Fault
Pressure drop
Pressure fl uctuations
In suction mode
Excess pressure
The motor does not start
Cause
> Air in the system
> High-pressure nozzle
blocked/worn
> Pressure control on the lance
is not set correctly
>
Engine speed too low
> Lack of water
>
Pump/accessories partially
frozen
> Water inlet hose is too long or
its cross-section too small
> Lack of water caused by
blocked water fi lter
> Lack of water because max.
permissible suction height
has not been heeded
>
Water too hot
> Pump draws in air (only
possible in suction mode)
>
Engine’s throttle control is
defective (accessory)
>
Low fuel level
> Low oil level in engine
> The pump is blocked or
frozen
Remedy
• Vent the system by operating
the spray gun several
times at short intervals. If
necessary, dismount the
lance (see section 4.2.2).
• Clean/replace the high-
pressure nozzle.
• Set the required working
pressure.
•
Contact Gerni Service
Department.
• Open the tap.
•
Thaw machine and
accessories.
• Use prescribed size of water
inlet hose.
• Clean the water fi lter in the
water connection (never
operate the machine without
water fi lter mounted!)
•
See chapter 4.2.2.
•
See chapter 4.2.2.
• Check that the suction set is
air-tight.
Repeat aeration.
•
Give less gas/contact Gerni
Service Department.
• Open fuel cock/fi ll with fuel.
• Fill with oil.
• Thaw machine/contact Gerni
Service Department.
