Viessmann VITODENS 200-W Service Instructions Manual page 95

Fault codes
(cont.)
Dis- Const.
played
fault
code
b0 X
b1 X
b5 X
b7 X
b8 X
bA
bb
bC
Weath.- System char-
comp. acteristics
X Burner blocked Short circuit,
X Control mode
as per deliv-
ered condition
X Control mode
as per deliv-
ered condition
X Burner blocked Boiler coding
X Burner blocked Lead break,
X Mixer regulates
to 20 °C flow
temperature.
X Mixer regulates
to 20 °C flow
temperature.
X Control mode
without remote
control
Troubleshooting
Cause Measures
Check flue gas
flue gas tem- temperature sen-
perature sen- sor
sor
Communica- Check connections
tion error, and replace pro-
programming gramming unit if
unit required
Internal fault Replace control
unit
Plug in boiler cod-
card faulty ing card or replace
if faulty
Check flue gas
flue gas tem- temperature sen-
perature sen- sor
sor
Communica- Check extension
tion error, kit connections and
extension kit code.
for heating
circuit 2 (with
mixer)
Communica- Check extension
tion error, kit connections and
extension kit code.
for heating
circuit 3 (with
mixer)
Communica- Check connec-
tion error, tions, cable, coding
remote con- address "A0" and
trol Vitotrol remote control DIP
heating circuit switches (see
1 (without page 127).
mixer)
95