Troubleshooting
10
RC35 programming unit - Technical specifications are subject to change without prior notice.
47
A11 803 Date is not
yet set.
Restricted functional-
ity for:
– All switching pro-
grams
– Holiday function
– Fault messages
Date details are miss-
ing, e.g. due to
lengthy power failure.
z Enter the current date.
A11 804 Internal
error.
Heating system is in
emergency mode.
Internal runtime error
in the RC35.
z Replace RC35.
A11 806 Room tem-
perature
sensor is
defect.
Since the actual room
temperature is miss-
ing, the following
functions do not
work:
– Room influence (for
outside temperature
control)
– Switch point optimi-
sation
In the case of room
temperature control,
the system is regu-
lated to max. tempera-
ture for HCx.
In-built temperature
sensor on the pro-
gramming unit /
remote control unit is
faulty.
z Replace the remote control unit.
A11 816 No commu-
nication
with RC35.
RC20/RF unable to
transmit data to
RC35. Room temper-
ature control there-
fore not possible for
HC.
RC20/RF has incor-
rect address.
z Check the address (parameter
P1) in RC20/RF.
RC35 not installed or
not correctly con-
nected.
z Check RC35 connection.
A12 815 Sensor sep-
arator mod-
ule is
defect.
Effects include inade-
quate supply to
downstream heating
circuits as they can
no longer be sup-
plied with the
requested heat quan-
tity.
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.
SC FC
Fault mes-
sage
Effect on control
characteristics
Possible cause Remedy
Table 19 Fault table
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