Bosch RC35 Installation And Service Instructions Manual page 57

SC FC Error display
A18 825 Two master
programmin
g units in the
system.
A2x 806 Room
temperature
sensor for
HCx is faulty.
A2x 816 No
communicati
on with
operating
unit HCx.
Table 23 Fault table
Logamatic EMS – 6 720 801 387 (2011/05)
Effect on control
characteristics
RC35 and RC2x regulate
both heating circuits and
DHW. Subject to the
selected heating
programs and the
required room
temperatures, the
heating system may no
longer function
correctly.DHW heating is
malfunctioning.
Since the actual room
temperature is missing,
the following cannot
function:
• Room influence (for
weather-compensated
control)
• Switching point
optimisation
With room temperature
compensated control it is
controlled to maximum
HKx temperature.
Since the actual room
temperature is missing,
the following cannot
function:
• Room influence
• Switching point
optimisation
Troubleshooting
Possible cause
RC2x and RC35 are
both logged on as
master.
Faulty integral
temperature sensor
on the heating
circuit's
programming unit /
remote control unit.
RC2x has incorrect
address, is
incorrectly wired or is
faulty.
Heating circuit has
not been registered
on the RFM20.
10
Remedy
B Change parameter
P1 in RC2x or
remove RC35
from EMS-BUS.
B Replace the
remote control
unit.
B Check address in
RC2x.
B Check function
and connection of
the remote control
unit.
B Replace the
remote control
unit.
57