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Worcester-Bosch CS 200 Manual

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Troubleshooting
CS200 – 6720830475 (2015/06)
If daily heat-up is activated:
• The entire DHW volume is heated up daily to the
temperature that has been set for the daily heat-up.
This function is not performed, if the domestic hot water
has already reached the set temperature within the last 12
hours due to solar heating.
• The daily heat-up starts automatically at the set time
according to the time set in the solar controller.
9 Troubleshooting
Table 12 During installation enter the ID number of the solar
controller here.
A fault in the system is indicated on the display of the solar
controller. The cause can be a fault on the solar controller, in a
component, in an assembly or on the heat source. The
instructions belonging to the affected component or assembly,
and especially the service manual with detailed fault
descriptions, contain additional information on
troubleshooting.
The solar controller saves the last 20 faults ( fault history,
page 12).
Only use original spare parts. Damage resulting from spare
parts, which are not supplied by the manufacturer, is excluded
from liability.
If a fault cannot be corrected, Worcester's Technical Support
department (see back cover).
Table 13 Fault displays with fault code A11
__ _
Fault code - sub-code - [cause or fault description]
A11 - 1010 - [No communication via BUS interface EMS 2]
Test procedure / Cause Corrective measure
Check whether the BUS cable
was connected correctly
Rectify wiring faults
and switch controller
off and on again
Check whether the BUS cable is
defective. Remove extension
module from EMS-BUS and
switch controller off and on
again. Check whether the cause
of the fault is a module or module
wiring
Repair or replace the
BUS cable.
Replace the defective
EMS-BUS node
A11 - 1038 - [Invalid time/date]
Test procedure / Cause Corrective measure
Date/time not yet set Set date/time
Prolonged loss of power supply Avoid voltage failures
A11 - 6004 - [No communication w. solar module]
Test procedure / Cause Corrective measure
Check configuration (set address
at the module). The selected
setting requires a solar module
Change configuration
Check the EMS connecting lead
to the solar module for damage.
BUS voltage at the solar module
must be between 12-15 V DC.
Replace damaged
cables
Solar module defective Replace the module
Fault code - sub-code - [cause or fault description]
A51 - 6021 - [Collector temperature sensor defective]
Test procedure / Cause Corrective measure
Check configuration. The
selected setting requires a
collector temperature sensor
Change configuration.
Check connecting lead between
solar module and collector
temperature sensor
Establish a sound
connection
Check collector temperature
sensor according to the table
( Chapter 3, page 5)
If values do not match,
replace the sensor
Check the voltage at the
terminals of the collector
temperature sensor on the solar
module according to the table
If the sensor values
matched, but the
voltage values do not
match, replace the
solar module
A51 - 6022 - [Bottom temperature sensor on cylinder 1
defective. Standby mode active]
Test procedure / Cause Corrective measure
Check configuration. The
selected setting requires a
temperature sensor at the
bottom of the cylinder
Change configuration
Check connecting lead between
solar module and bottom
cylinder temperature sensor
Establish a sound
connection
Check the electrical connection
of the connecting lead at the solar
module
If a screw or plug is
loose, rectify the
contact problem
Fault code - sub-code - [cause or fault description]
… 14


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