Troubleshooting - Hilti VC 20-U Manual

9 Transport and storage
9.1 Transport
Do not carry the appliance when it is full of waste material.
The appliance may not be lifted directly by crane.
▶ Remove the power conditioner (if applicable) or loose accessory tools from the holder.
▶ Empty the appliance before carrying it to another location.
▶ Do not tip the appliance or transport it lying on its side after using it to pick up liquids.
▶ Use the tapered adapter to connect both ends of the hose together conveniently for transport.
Applicable to UM and UME vacuum cleaners
DANGER
Risk of injury. Hazardous material that has been picked up may escape through the suction hose
inlet socket.
▶ Close the hose inlet socket on a Class M vacuum cleaner with the cap provided before
transportation and when the appliance is not in use.
9.2 Storage
▶ Store the vacuum cleaner in a secure, dry place where it is inaccessible to unauthorized users.

10 Troubleshooting

If the trouble you are experiencing is not listed in this table or you are unable to remedy the problem by
yourself, please contact Hilti Service.
10.1 Troubleshooting table
Malfunction
UM and UME vacuum
cleaners: Acoustic warning
signal (reduced suction
power)
Dust is blown out of the appli-
ance.
The appliance switches it-
self off or on inadvertently or
static electricity discharges
through the user.
The appliance doesn't start or
switches itself off after a short
time.
The motor doesn't restart.
Printed: 25.08.2017 | Doc-Nr: PUB / 5370890 / 000 / 00
Possible cause
The dust bag is full.
The filter element is clogged with
dirt or dust.
The suction hose or dust hood on
the electric tool is blocked.
The hose diameter setting is incor-
rect.
The filter element is not fitted cor-
rectly.
The filter element is damaged.
Electrostatic charge is not
conducted away – the
appliance is connected to an
unearthed/ungrounded power
outlet.
The water level cut-out is acti-
vated.
The mains circuit breaker has been
tripped.
The waste material container is full. ▶ Switch the appliance off and
Action to be taken
▶ Change the dust bag.
▶ If the automatic filter cleaning
system is deactivated, activate
it and allow the vacuum cleaner
to run for 30 seconds.
▶ Clean the suction hose and the
dust hood.
▶ Set the hose diameter.
▶ For applications with a hollow
drill bit, select a hose diameter
of 15 mm.
▶ Fit the filter element again
correctly.
▶ Fit a new filter element.
▶ Connect the appliance to an
earthed/grounded power outlet
and use an antistatic suction
hose.
▶ Clean the sensors and the
area around the sensors with a
brush.
▶ Reset the circuit breaker.
▶ Find the reason for the overload
current if the circuit breaker
trips again.
empty the waste material
container.
English 15