Troubleshooting
10
RC35 programming unit - Technical specifications are subject to change without prior notice.
49
A2x 829 RC20/RF as
remote con-
trol.
RC20/RF unable to
transmit data to
RC35. Room temper-
ature control there-
fore not possible for
this HC.
RC20/RF address not
correctly assigned in
RC35 or not installed
in RC35.
z Set the operating unit parame-
ter in RC35 to RC20/RF.
z Check the assignment of the
RC20/RF.
A2x 830 Low battery
for wireless
oper. unit
HCx.
No effect if the battery
is replaced in time.
Battery in RC20RF for
HCx is low.
z Replace batteries.
A2x 839 No wireless
comm. with
oper. unit
HCx.
Wireless
malfunc-
tion.
Since the actual room
temperature is miss-
ing, the following
functions do not
work:
– Room influence
– Switch point optimi-
sation
The RFM20 operates
with the last values
set on the remote
control unit.
RC20RF is outside
the range of recep-
tion.
z Bring the RC20RF within the
range of reception.
Heating system has
been switched off.
z Switch on the heating system.
When RFM20 was
replaced, the
RC20RF was not reg-
istered on the new
RFM20.
z Register the RC20RF (see docu-
mentation for RC20RF).
A2x 842 Frost prot.
selected but
no
rem.contr.
HCx.
Since the actual room
temperature is miss-
ing, the following
functions do not
work:
– Room influence
– Switch point optimi-
sation
EMS operates with
the last values set on
the remote control
unit.
No programming unit /
remote control unit
assigned, although
frost protection is
set to room temper-
ature.
z Check the operating unit
parameter.
z Change frost protection to
outside temperature if neces-
sary.
A2x 843 Room con-
trol
selected but
no
rem.contr.
HCx.
No programming unit /
remote control unit
assigned, although
room temp. control-
led is set.
z Check the operating unit
parameter.
z Change to outside temp. con-
trolled if necessary.
SC FC
Fault mes-
sage
Effect on control
characteristics
Possible cause Remedy
Table 19 Fault table
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