Bosch CRC200 - 9 Troubleshooting

6 720 821 651 (2017/05) CRC200
26 | Troubleshooting
9 Troubleshooting
A fault appears on the display of the user interface. The cause
can be a fault on the user interface, in a component, in an
assembly or on the heat source. The instructions belonging to
the affected component, assembly or heat source used and
especially the service manual with detailed fault descriptions
contain additional information on troubleshooting. Many heat
source faults do not appear on the display of the user interface.
They are described in the documents for the heat source used.
The last 20 faults that occurred are saved with a time stamp
(fault history,  Page 25).
Use only original spare parts. Damage
resulting from spare parts not supplied by the
manufacturer is not covered under warranty.
If a fault cannot be corrected, contact the
service technician responsible for your area or
the nearest Bosch office.
Fault code Sub- code
Cause or fault description Testing sequence/Cause Measure
A11 6004 Solar module wrongly
activated
– Deactivate solar module in the service
settings ( Bild 12, Seite 16).
A12 815 Supply temperature sensor
faulty
(3201 = Heating zone 1;
...
3208 = Heating zone 8)
Check cable connecting supply
temperature sensor and zone module
If there is a fault, replace cable/sensor
Check connection between zone
module and supply temperature
sensor
If screws or a plug is loose, rectify the contact
problem
Check the supply temperature sensor
against its data table
If values do not agree, replace the sensor
Check the voltage to the connection
terminals of the supply temperature
sensor on the zone module against its
data table
If sensor values agree but the voltage values
do not, replace the zone module
A31
...
A38
3101
...
3108
Zone module has no
communication to CRCx00 in
the heating zone
(3101 = Heating zone 1;
...
3108 = Heating zone 8)
Check configuration on the
corresponding controller
Assign the correct heating zone and set
Control type to Room supply, if outdoor
temperature sensor not installed.
Check heating zone assignment on
other controllers
Assign the correct heating zones
Check if cable for EMS connection is
damaged
Replace damaged cable
Controller defective Replace defective controller
A31
...
A38
3201
...
3208
Zone module detects
unreasonable status of the
end switch
(3201 = Heating zone 1;
...
3208 = Heating zone 8)
Check corresponding zone valve and
end switch for status and defects
Replace faulty zone valve or end switch
Module wrongly configured: switch is
in the wrong position.
See installation instructions CZM100,
chapter 2.2
Table 13 Fault table