Maintenance and Service
Store and
!
WARNING
transport the
measuring tool only in the
supplied protective case.
Keep the measuring tool clean
at all times.
Do not immerse the measuring
tool into water or other fluids.
Wipe off debris using a moist
and soft cloth. Do not use any
cleaning agents or solvents.
Maintain the reception lens 12
in particular, with the same
care as
required for eye glasses or the
lens of a camera.
The battery is not serviceable
and should be repaired by an
authorized service center.
If the measuring tool should
fail despite the care taken in
LIMITED WARRANTY OF BOSCH LASER AND
Robert Bosch Tool Corporation ("Seller") warrants to the original purchaser only, that all Bosch lasers and
measuring tools will be free from defects in material or work¬manship for a period of one (1) year from
date of purchase. Bosch will extend warranty coverage to two (2) years when you register your product
within eight (8) weeks after date of purchase. Product registration card must be complete and mailed
to Bosch (postmarked within eight weeks after date of purchase), or you may register on-line at www.
boschtools.com/Service/ProductRegistration. If you choose not to register your product, a one (1) year
limited warranty will apply to your product.
30 Day Money Back Refund or Replacement -
If you are not completely satisfied with the performance of your laser and measuring tools, for any
reason, you can return it to your Bosch dealer within 30 days of the date of purchase for a full refund
or replacement. To obtain this 30-Day Refund or Replacement, your return must be accompanied by
the original receipt for purchase of the laser or optical instrument product. A maximum of 2 returns per
customer will be permitted.
MEASURING TOOL PRODUCTS
Limited Warranty Program
-19-
manufacturing and testing
procedures, repair should be
carried out by an authorized
after-sales service center
for Bosch power tools. Do
not open the measuring tool
yourself.
In all correspondence and
spare parts orders, please
always include the 10-digit
article number given on the
type plate of the measuring
tool.
In case of repairs, send in the
measuring tool packed in its
protective case 16.
DISPOSAL
Measuring tools, batteries,
accessories and packaging
should be sorted for
environmental-friendly recycling.
Need help?
Do you have a question about the GLM 40 and is the answer not in the manual?
Questions and answers
It won't work, won't come on and I changed the batteries
If your Bosch GLM 40 is not turning on even after changing the batteries, consider the following possible reasons:
1. Incorrect Battery Installation – Ensure the batteries are inserted with the correct polarity as indicated inside the battery compartment.
2. Low Battery Voltage – If using rechargeable batteries (1.2V), they may provide fewer measurements compared to standard alkaline batteries (1.5V). Try using fresh alkaline batteries.
3. Battery Contacts – Check for dirt or corrosion on the battery contacts inside the compartment. Clean them if necessary.
4. Battery Compartment Cover – Ensure the battery compartment cover is securely closed.
5. Expired or Faulty Batteries – Even new batteries can sometimes be defective. Try replacing them with another set.
6. Device Malfunction – If none of the above steps work, the device may have an internal fault requiring professional inspection or repair.
If the issue persists, consider contacting Bosch support for further assistance.
This answer is automatically generated