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Tilting or rotation in various functions can be
accelerated if the respective tilting or rotation
buttons on the laser level or the remote con-
trol are held down for longer.
All functions are reset to their standard set-
ting when the laser level is switched off.
Switching On and Off
Note: After the first time the tool is started up
and before beginning work, you should always
perform an accuracy check (see “Accuracy
Check of the Laser level”, page 28).
To switch on the laser level, press the on/off
button (11). The start screen will appear for
a few seconds, followed by the home screen.
The laser level emits the variable laser beam
(8) and the plumb beam up (for GRL4000-
80CHV only) (10) from the outlet apertures
(9).
Do not point the laser
beam at persons or ani-
mals and do not look into the laser beam
yourself, not even from a large distance.
Leveling starts automatically and
is shown by the flashing leveling
indicator on the display, the flash-
ing laser beams and the flashing
status display (12) (see “Automatic leveling”,
page 25).
After leveling has suc-
cessfully been com-
pleted, the home
screen will appear, the
laser beams will light up continuously, rota-
tion will start and the status display will light
up green continuously.
Do not leave the switched
on tool unattended and
switch the tool off after use.
To switch off the laser level, press
and hold the on/off button (11) un-
til the switch off symbol appears
on the display.
If the maximum permitted operat-
ing temperature of 50 °C is ex-
ceeded, a warning message will
appear for a few seconds and the
status display (12) will flash red.
The laser level will then shut down in order
to protect the laser diode. Once it has cooled
down, the laser level is operational again and
can be switched back on.
Establishing a connection to the remote
control/laser receiver
In the default factory setting, the laser level,
the remote control (41) and the laser receiver
(42) which come with the set are already con-
nected via Bluetooth®.
To connect the remote con-
trol or the laser receiver,
press and hold the Blue-
tooth® button (7) until the indicator for estab-
lishing a connection with the remote control/
laser receiver appears on the display.
To establish a connection to the remote con-
trol, then press the button for anticlockwise
rotation (30) and the button for clockwise
rotation (37) on the remote control, both for
five seconds and at the same time. While the
connection to the remote control is being es-
tablished, the status indicators (34) and (35)
on the remote control will alternately flash
green.
To establish a connection to the laser receiv-
er, press on the X-axis and Y-axis buttons on
the laser receiver for five seconds at the same
time. For this, please observe the operating
instructions for the laser receiver.
It will be confirmed on the
display whether a connec-
tion has successfully been
established to the remote
control or the laser receiver. The status indi-
cator (12) on the laser level and the status
indicators (34) and (35) on the remote con
trol will light up green for three seconds.
If no connection could be
established, an error mes-
sage will appear on the dis-
play and the status indica-
tor (12) on the laser level will light up red for
three seconds. If the attempt to establish a
connection to the remote control has failed,
the status indicators (34) and (35) on the re-
mote control will also light up red for three
seconds.
Two laser receivers can work with the laser
level at the same time.
If other remote controls or laser receivers are
connected, the oldest connection will then be
deleted.
Remote control via the Bosch Leveling
Remote App
The laser level is equipped with a Bluetooth®
module which uses radio technology to en-
