Bosch Truvo Original Instructions Manual page 26

26 | English
Error when searching for and indicating metal
Cause
Light-up ring lights up yellow or red even though there is no metal
nearby.
Ambient temperature too
high/too low
Strong temperature vari-
ation
Auto-calibration not suc-
cessful
Light-up ring lights up yellow or red over a large measuring range on
the wall.
Many metal objects
spaced closely together
Building materials con-
taining metal or reinfor-
cing steel in concrete
Solid metal objects on
the back of the wall
Auto-calibration not suc-
cessful
Metal object not found.
Metal object is too deep
or too small.
Error when searching for and indicating live cables
Cause
Light-up ring lights up red over a large measuring range on the wall.
Insufficient earthing of
the wall
1 609 92A 8B4 | (02.03.2023)
Corrective measures
Only use the measuring tool in the operating
temperature range.
Allow the measuring tool to reach the correct
temperature.
Manually recalibrate the measuring tool.
Metal objects spaced too closely together can-
not be detected separately.
In the presence of metallic building materials
(e.g. foil-laminated insulation materials, heat
conduction plates), reliable detection is not pos-
sible.
In the presence of solid metal objects (e.g. radi-
ators), reliable detection is not possible.
Manually recalibrate the measuring tool.
The detection depth depends on the building
material and on the object and may be less than
the maximum detection depth.
Corrective measures
Touch the wall with your free hand at a distance
of 20−30 cm from the measuring tool in order to
earth the wall.
Bosch Power Tools