in as the battery does not engage. It is simply secured in the
correct position when you close the cover.
To initialise the GCY 42 after inserting the battery, press the
on/off switch of the power tool.
Changing the Battery
(see figures B1–B4)
Only remove the used battery (1) with your fingers.
A warning will be displayed in the app before the battery is
fully used up.
Removing the GCY 42
(see figures C1–C2)
Do not use force to remove the GCY 42 (2). Do not use any
sharp or pointed tools.
Note: Turning the power tool over may make it easier to re-
move the GCY 42.
Starting operation
Once you have inserted the battery (1) and pressed the on/
off switch on the power tool, the GCY 42 will transmit a sig-
nal continuously. The Bluetooth® signal will only stop the bat-
tery is drained or faulty, or if the battery is removed.
You can find further information directly in the app from
Bosch.
Installing and Setting up the App
The following QR code takes you to the corresponding Bosch
app.
You will need to install the corresponding Bosch app before
you can use the GCY 42.
– Download the corresponding Bosch app from the relevant
app store (Apple App Store, Google Play Store).
Note: You will need to have a user account with the relev-
ant app store to do this.
– Then select the MyTools sub-item in the app.
– The display of your mobile device shows you all of the
subsequent steps required to connect the power tool to
the mobile device.
Note: Work through the app tutorial in full first. This will give
you a better overview of how the connection is made and
how the connectivity functions are used.
Data Transfer via Bluetooth®
The GCY 42 transmits a signal at regular intervals. The ambi-
ent conditions may mean it takes several transmission inter-
vals for the GCY 42 to be detected. If the GCY 42 is not de-
tected, check the following:
Bosch Power Tools
– Is the distance to the mobile terminal device too great?
Reduce the distance between the mobile device and the
GCY 42.
– Is the battery too low or drained?
Change the battery.
– Switch Bluetooth® off and on again on your mobile device.
Check whether the GCY 42 has now been detected.
Maintenance and Service
Maintenance and Cleaning
Remove any dirt using a brush. Do not use any detergents or
solvents.
After-Sales Service and Application Service
Our after-sales service responds to your questions concern-
ing maintenance and repair of your product as well as spare
parts. You can find explosion drawings and information on
spare parts at: www.bosch-pt.com
The Bosch product use advice team will be happy to help you
with any questions about our products and their accessor-
ies.
In all correspondence and spare parts orders, please always
include the 10‑digit article number given on the nameplate
of the product.
Great Britain
Robert Bosch Ltd. (B.S.C.)
P.O. Box 98
Broadwater Park
North Orbital Road
Denham Uxbridge
UB 9 5HJ
At www.bosch-pt.co.uk you can order spare parts or arrange
the collection of a product in need of servicing or repair.
Tel. Service: (0344) 7360109
You can find further service addresses at:
www.bosch-pt.com/serviceaddresses
Disposal
GCY 42 modules, accessories and packaging should be re-
cycled in an environmentally friendly manner.
Do not dispose of electronic components and
batteries into household waste!
Only for EU countries:
According to the Directive 2012/19/EU on waste electrical
and electronic equipment and its transposition into national
law, power tools that are no longer usable, and, according to
the Directive 2006/66/EC, defective or drained batteries
must be collected separately and disposed of in an environ-
mentally correct manner.
If disposed incorrectly, waste electrical and electronic
equipment may have harmful effects on the environment and
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