Troubleshooting
10
RC35 programming unit - Technical specifications are subject to change without prior notice.
48
A12 816 No commu-
nication
with sepa-
rator mod-
ule.
Heating circuit
pump 1 is perma-
nently activated.
WM10 or bus cable is
incorrectly connected
or faulty.
WM10 not recog-
nised by RC35.
z Check terminals on WM10 and
check bus cable.
z Replace WM10.
A18 825 Two master
operating
units in sys-
tem.
RC35 and RC20 are
both controlling heat-
ing circuits and DHW.
Depending on the set
heating programs and
the desired room tem-
perature, the heating
system may no longer
operate correctly.
Faulty DHW heating.
RC20 and RC35 are
both registered as
master.
z Change parameter P1 in RC20
or remove RC35 from the EMS
bus.
A2x 806 Room tem-
perature for
HCx 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.
A2x 816 No commu-
nication
with operat-
ing unit
HCx.
Since the actual room
temperature is miss-
ing, the following
functions do not
work:
– Room influence
– Switch point optimi-
sation
RC20 has incorrect
address, is incorrectly
wired or is faulty.
Heating circuit has not
been registered on
the RFM20.
z Check the address in the RC20.
z Check function and connection
of the remote control unit.
z Replace the remote control unit.
SC FC
Fault mes-
sage
Effect on control
characteristics
Possible cause Remedy
Table 19 Fault table
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