Display fault
code
System char-
acteristics
Cause Measures
bd Control mode
without remote
control
Communication fault –
Vitotrol remote control,
heating circuit with mixer
M2
bE Control mode Vitotrol remote control in-
correctly encoded
Check remote
control DIP switch
setting (see
page 97)
bF Control mode Incorrect LON communi-
cation module
Replace the LON
communication
module
C2 Control mode Communication fault –
solar control unit
Check connec-
tions and coding
address "54"
C5 Control mode,
max. pump
speed
Communication fault – in-
ternal variable speed
pump
Check coding ad-
dress "30" set-
tings; check the
heating circuit
pump DIP switch
settings
C6 Control mode,
max. pump
speed
Communication fault –
variable speed circulation
pump, heating circuit with
mixer M2
Check coding ad-
dress "E5" set-
tings; check the
heating circuit
pump DIP switch
settings
C7 Control mode,
max. pump
speed
Communication fault –
variable speed circulation
pump, heating circuit A1
Check coding ad-
dress "E5" set-
tings; check the
heating circuit
pump DIP switch
settings
Cd Control mode Communication fault
Vitocom 100 (KM BUS)
Check the
Vitocom 100 and
connections
CE Control mode Communication fault –
ext. extension
Check connec-
tions and coding
address "2E" set-
tings
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