Troubleshooting
10
RC35 programming unit - Technical specifications are subject to change without prior notice.
46
A01 811 Thermal
disinfection
was unsuc-
cessful.
Thermal disinfection
has been interrupted.
Water draw too great
during the disinfec-
tion period.
z Select a time for thermal disinfec-
tion when there is no other
demand for heat.
Boiler output is too
low for heat to be
used for other pur-
poses at the same
time (e.g. 2nd heating
circuit).
Sensor incorrectly
connected or
installed.
Breakage or short cir-
cuit in the sensor lead.
Sensor is faulty.
z Check the sensor connection
and the sensor lead.
z Check that the sensor is cor-
rectly mounted.
z Compare resistance values with
the sensor characteristic curve.
DHW pump is faulty. z Check that the DHW pump is
working, e.g. by carrying out a
function test.
A01 816 No commu-
nication
with UBA/
MC10, or
DBA.
The boiler no longer
receives heat demand
signals; the heating
system no longer pro-
vides heat.
EMS bus system is
overloaded.
z Reset by switching the heating
system on and off.
z Notify customer support if neces-
sary.
UBA3/MC10 or DBA
is faulty.
A01 828 Water pres-
sure sensor
is defect.
Digital water pressure
sensor is faulty.
z Replace the water pressure sen-
sor.
A02 816 No commu-
nication
with BC10.
BC10 settings are no
longer accepted by
RCxx devices.
Contact problem on
BC10 or BC10 is
faulty.
z Check BC10 connection.
z Replace BC10 if necessary.
A11 801 Internal
error
Heating system is in
emergency mode.
Internal runtime error
in the RC35.
z Replace RC35.
A11 802 Time not yet
set.
Restricted functional-
ity for:
– All switching pro-
grams
– Fault messages
Time details are miss-
ing, e.g. due to
lengthy power failure.
z Enter the current time.
SC FC
Fault mes-
sage
Effect on control
characteristics
Possible cause Remedy
Table 19 Fault table
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