Bosch RC35 - Page 58

Troubleshooting
Logamatic EMS – 6 720 801 387 (2011/05)
58
10
A2x 829 RC20/RF as
remote
control.
RC20/RF unable to
transmit data to RC35.
Therefore no room
temperature
compensated control
possible for this heating
circuit.
RC20/RF address
incorrectly allocated
in RC35 or not
installed in RC35.
B Set
programming
unit parameters in
the RC35 to
RC20/RF.
B 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 RC20/RF
for HCx is low.
B Replace batteries.
A2x 839 No radio
communicati
on with
programmin
g unit HKx.
Radio fault.
Since the actual room
temperature is missing,
the following cannot
function:
• Room influence
• Switching point
optimisation
The RFM20 operates
with the last values set
on the remote control
unit.
RC20/RF is outside
the range of
reception.
B Bring the RC20/
RF within the
range of reception.
Heating system has
been switched off.
B Switch on the
heating system.
When RFM20 was
replaced, the RC20/
RF was not
registered on the
new RFM20.
B Register the
RC20/RF (see
documentation for
RC20/RF).
A2x 842 Frost
protection
selected but
no frost
mode HKx.
Since the actual room
temperature is missing,
the following cannot
function:
• Room influence
• Switching point
optimisation
The 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
temperature.
B Check
programming
unit parameters.
B Possibly change
over Frost
protection to
outside
temperature.
A2x 843 Room
control
selected but
no
rem.contr.
HCx.
No programming
unit/remote
programmer
allocated, although
room temperature
compensated is
set.
B Check
programming
unit parameters.
B If required switch
to outside
temperature
compensated.
SC FC Error display
Effect on control
characteristics Possible cause Remedy
Table 23 Fault table