6 720 813 621 (2014/12)MM100
Troubleshooting | 19
5Troubleshooting
The indicator shows the operating condition of the module.
If a fault occurs on the module, the mixing valve in the
connected heating circuit will be set to a position determined
by the module. This means that it is possible to continue
operating the system with a reduced output.
Certain faults are also shown on the display of the user
interface assigned to the heating circuit, and on the display of
the higher-level user interface where applicable.
6 Environment / disposal
Environmental protection is a fundamental corporate strategy
of the Bosch Group.
The quality of our products, their efficiency and environmental
safety are all of equal importance to us and all environmental
protection legislation and regulations are strictly observed.
We use the best possible technology and materials for
protecting the environment taking into account of economic
considerations.
Packaging
We participate in the recycling programmes of the countries in
which our products are sold to ensure optimum recycling.
All of our packaging materials are environmentally friendly and
can be recycled.
Old electrical and electronic appliances
Electrical or electronic devices that are no
longer serviceable must be collected
separately and sent for environmentally
compatible recycling (in accordance with the
European Waste Electrical and Electronic
Equipment Directive).
To dispose of old electrical or electronic
devices, you should use the return and
collection systems put in place in the country
concerned.
Only use genuine parts. Any damage resulting
from spare parts that are not supplied by the
manufacturer is excluded from liability.
If a fault cannot be rectified, please contact the
responsible service engineer.
0
1
2
3
4
5
6
7
8
9
10
6 720 645 409-20.1o
Indicator Possible cause Remedy
Constantly OFF Coding card on 0 ▶ Set the coding card.
Power supply interrupted. ▶ Switch on the power supply.
Fuse is defective ▶ When the power supply is switched off, replace the fuse
( Fig. 16, page 96).
Short circuit in the BUS connection ▶ Check BUS connection and repair if required.
Constantly red Internal fault ▶ Replace module.
Flashing red Coding card in invalid position or in
intermediate position
▶ Set the coding card.
Temperature limiter on MC1 (15-16) is
not connected
▶ Connect the jumper (supplied) or a temperature limiter to
MC1.
Flashing green Maximum cable length for BUS
connection exceeded.
▶ Make shorter BUS connection.
Fault shown on user interface display ▶ The user interface instructions and the service manual contain
further information on troubleshooting.
Constantly green No fault Standard operation.
Table 6
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