Viessmann Vitotronic 200 Installation And Service Instructions Manual page 62

Troubleshooting
Faults that are displayed at the programming unit
Fault code System character-
on the dis- istics
play
AC Control mode
b0 Control mode
b1 Control mode
b4 Emissions test func-
tion (see page 106)
b5 Control mode
b6 Constant mode
b7 Boiler water tem-
perature regulated
by control thermo-
stat "R"
b8 Control mode
bC Control mode with-
out remote control
62
Cause Measures
Return tempera- Insert plug aJA and
ture control con- check coding
figuration fault:
Code "OC:1" has
been selected,
but plug aJA is
not plugged in
and/or
Code "4E:0" has
not been set
Flue gas tem- Check the flue gas tem-
perature sensor perature sensor (see
shorted out page 113)
Communication Check connections and
fault, program- replace the program-
ming unit ming unit, if required
Internal electro- Check the electronics
nics fault PCB and replace, if re-
quired
Internal electro- Check the electronics
nics fault PCB and replace, if re-
quired
Invalid hardware Check coding address
recognised "92"; "92:164" must be
selected
Boiler coding card Plug in the boiler coding
fault card or replace if faulty
(see page 18)
Flue gas tem- Check the flue gas tem-
perature sensor perature sensor (see
lead broken page 113).
Without flue gas tem-
perature sensor:
Set code "1F:0"
Communication Check connections,
fault Vitotrol re- cable, coding address
mote control, "A0" and remote control
heating circuit A1 DIP switches (see
page 115 and 116)
(cont.)