100
Dis-
played
fault
code
Const.
Weath.-
comp.
System char-
acteristics
Cause
Measures
b0
X
X
Burner blocked Short circuit,
flue gas tem-
perature sen-
sor
Check the flue gas
temperature sen-
sor
b1
X
X
Control mode
as per deliv-
ered condition
Communica-
tion error,
programming
unit
Check connections
and replace the
programming unit if
required
b5
X
X
Control mode
as per deliv-
ered condition
Internal fault
Replace the control
unit
b7
X
X
Burner blocked Boiler coding
card faulty
Plug in boiler cod-
ing card or replace,
if faulty
b8
X
X
Burner blocked Lead break,
flue gas tem-
perature sen-
sor
Check the flue gas
temperature sen-
sor
bA
X
Mixer regulates
to a flow tem-
perature
of 20 °C
Communica-
tion error,
extension kit
for heating
circuit 2 (with
mixer)
Check extension
kit connections and
codes
bb
X
Mixer regulates
to a flow tem-
perature
of 20 °C
Communica-
tion error,
extension kit
for heating
circuit 3 (with
mixer)
Check extension
kit connections and
codes
bC
X
Control mode
without remote
control
Communica-
tion error,
remote con-
trol Vitotrol
heating circuit
1 (without
mixer)
Check connec-
tions, cable, coding
address "A0" and
remote control DIP
switches (see
page 132)
Troubleshooting
Fault codes
(cont.)
5692 843 GB
Summary of Contents for Vitodens 200 WB2C 45
Page 147: ...147 5692 843 GB...
