Hilti VC 20-U-Y Manual De Instrucciones página 39

Fault
The warning tone is activated
(reduced suction performance;
VC 20‑UM‑Y/ VC 40‑UM‑Y).
Dust is blown out of the appli-
ance.
The appliance doesn't start or
switches itself off after a short
time.
No battery is detected, i.e. no
LED lights or blinks.
9.2 Mains-powered operation
Fault
The motor doesn't restart.
The appliance switches itself off
or on inadvertently or the user
receives electric shocks (static
discharge).
The charging station status LED
blinks.
Doesn't switch over to a dis-
charged battery.
The motor doesn't run when set
to "AUTO".
The automatic filter element
cleaning system doesn't work.
Printed: 28.03.2019 | Doc-Nr: PUB / 5140202 / 000 / 04
Possible cause
The filter element is clogged with dirt
or dust.
Blockage in the hose, vacuum cleaner
or power tool dust hood.
The hose diameter selector switch is
set incorrectly.
Dust on the sealing surfaces between
the container and top section of the
appliance.
The filter element is not fitted cor-
rectly.
The filter element is damaged.
The filter seal is damaged.
The container level monitoring system
has been triggered.
The battery was inserted and
removed too quickly.
Possible cause
The mains circuit breaker has been
tripped.
The container is full.
Electrostatic charge is not dissipated
correctly; the appliance is connected
to an unearthed/ungrounded power
outlet.
The battery is too hot or too cold.
No contact.
The battery was not detected.
The electric tool is faulty or is not
plugged in fully.
No suction hose is connected.
APFC button is in the OFF position
(LED doesn't light).
Remedy
Switch the automatic filter cleaning
system on then perform the "power
cleaning" procedure: Disconnect
the suction hose, cover the suction
opening with your hand and keep it
covered until three cleaning cycles
have been completed.
Change the filter element if neces-
sary.
See section: 8.1 Changing the filter
element
Clean the hose and dust hood.
See section: 7.3 Hose diameter set-
ting (VC 20‑UM‑Y/ VC 40‑UM‑Y)
Clean the sealing surfaces.
Remove the filter element and refit it
correctly.
Fit a new filter element.
Fit a new filter element.
Clean the container level monitoring
sensors and surrounding area with a
brush.
Pull the battery out, wait approx. 2
seconds, and then re-insert it.
Remedy
Reset the circuit breaker. Find the
reason for the overload current if it
trips again.
Switch the appliance off. Empty the
container.
See section: 7.9.2 Emptying the
waste material container when no
dust bag is fitted (collecting liquids)
Connect the appliance to an
earthed/grounded power outlet; use
an antistatic hose.
Bring the battery to room temperat-
ure.
Reinsert the battery.
Remove the battery from the appli-
ance and contact Hilti.
Check the electric tool for correct op-
eration and plug it in fully.
Connect the suction hose.
Press the APFC button.
en
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