Bosch RC35 Installation And Service Instructions Manual page 58

Troubleshooting
10
SC FC Error display
A2x 829 RC20/RF as
remote
control.
A2x 830 Low battery
for wireless
oper. unit
HCx.
A2x 839 No radio
communicati
on with
programmin
g unit HKx.
Radio fault.
A2x 842 Frost
protection
selected but
no frost
mode HKx.
A2x 843 Room
control
selected but
no
rem.contr.
HCx.
Table 23 Fault table
58
Effect on control
characteristics
RC20/RF unable to
transmit data to RC35.
Therefore no room
temperature
compensated control
possible for this heating
circuit.
No effect if the battery is
replaced in time.
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.
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.
Possible cause
RC20/RF address
incorrectly allocated
in RC35 or not
installed in RC35.
Battery in RC20/RF
for HCx is low.
RC20/RF is outside
the range of
reception.
Heating system has
been switched off.
When RFM20 was
replaced, the RC20/
RF was not
registered on the
new RFM20.
No programming unit
/ remote control unit
assigned, although
frost protection is
set to room
temperature.
No programming
unit/remote
programmer
allocated, although
room temperature
compensated is
set.
Logamatic EMS – 6 720 801 387 (2011/05)
Remedy
B Set
programming
unit parameters in
the RC35 to
RC20/RF.
B Check the
assignment of the
RC20/RF.
B Replace batteries.
B Bring the RC20/
RF within the
range of reception.
B Switch on the
heating system.
B Register the
RC20/RF (see
documentation for
RC20/RF).
B Check
programming
unit parameters.
B Possibly change
over Frost
protection to
outside
temperature.
B Check
programming
unit parameters.
B If required switch
to outside
temperature
compensated.