Bosch CW 400 - Eliminate fault; 9.1 Eliminating sensed faults

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Eliminate fault | 43
9 Eliminate fault
9.1 Eliminating "sensed" faults
A "sensed" fault can have various causes, which can usually be
eliminated by taking simple steps.
If it is too cold or hot for you, for example, the following table
will help you eliminate "sensed" faults.
Problem Reason Solution
Required
room
temperature
not achieved.
Thermostatic valves
on the radiators are
set too low.
Set the thermostatic
valves higher.
Temperature for
heating mode is set
too low.
Set the temperature
for heating mode
higher.
System in summer
mode.
Switch system over
to winter mode
(Æ Chapter 5.3.4,
page 25).
Flow temperature
controller at heat
source set too low.
Set flow temperature
controller higher
(Æ operating
instructions for the
heat source).
Air in the heating
system.
Vent the radiators
and the heating
system.
Installation location of
the outdoor
temperature sensor is
unfavourable.
Contact contractor to
install the outside
temperature sensor
at a suitable
installation location.
Table 39 Eliminating "sensed" faults
Required
room
temperature
greatly
exceeded.
Radiators become too
hot.
Set thermostatic
valves in adjoining
rooms lower.
Set temperature for
the relevant
operating mode
lower.
Set temperature for
all operating modes
lower.
If the user interface is
installed in the
reference room, if the
installation location of
controller is
unfavourable,
e.g. external wall,
close to window, in a
draught, ...
Contact contractor to
install the user
interface at a suitable
installation location.
Excessive
room
temperature
fluctuations.
Temporary influence
of external heat on the
room, e.g. from solar
exposure, room
lighting, TV, fireplace
etc.
Contact contractor to
install the user
interface at a suitable
installation location.
Temperature
rises instead
of dropping.
Incorrect time set.
Set the time.
Room
temperature
too high
during
setback
mode.
The building retains a
lot of heat.
Set an earlier
switching time for
setback mode.
Problem Reason Solution
Table 39 Eliminating "sensed" faults