Viessmann Vitodens 222-F Installation And Service Instructions For Contractors page 84

Troubleshooting
Fault codes
(cont.)
Fault code Const.
displayed
b5 X
b7 X
b8 X
bA
bb
bC
bd
bE
bF
C1 X
84
Weather- System characteris-
comp. tics
X Control mode as per
delivered condition
X Burner blocked
X Burner blocked
X Mixer regulates to
20 °C flow tempera-
ture.
X Mixer regulates to
20 °C flow tempera-
ture.
X Control mode without
remote control
X Control mode without
remote control
X Control mode without
remote control
X Control mode
X Control mode
Cause Measures
Internal fault Replace the control unit
Boiler coding card Plug in or replace the boil-
fault er coding card.
Lead break, flue Check the flue gas tem-
gas temperature perature sensor (see
sensor page 94).
Communication er- Check the extension kit
ror, extension kit connections and coding
for heating circuit 2
(with mixer)
Communication er- Check the extension kit
ror, extension kit connections and coding
for heating circuit 3
(with mixer)
Communication er- Check connections, ca-
ror, Vitotrol remote ble, coding address "A0"
control, heating cir- in group "Heating cir-
cuit 1 (without mix- cuit..."/5 and remote con-
er) trol configuration (see
page 132).
For wireless remote con-
trols: Check connection,
place remote control unit
close to the boiler.
Communication er- Check connections, ca-
ror, Vitotrol remote ble, coding address "A0"
control, heating cir- in group "Heating cir-
cuit 2 (with mixer) cuit..."/5 and remote con-
trol configuration (see
page 132).
For wireless remote con-
trols: Check connection,
place remote control unit
close to the boiler.
Communication er- Check connections, ca-
ror, Vitotrol remote ble, coding address "A0"
control, heating cir- in group "Heating cir-
cuit 3 (with mixer) cuit..."/5 and remote con-
trol configuration (see
page 132).
For wireless remote con-
trols: Check connection,
place remote control unit
close to the boiler.
Incorrect LON Replace LON communi-
communication cation module
module
Communication er- Check connections
ror, EA1 extension Without EA1 extension:
Set code "5b:0" in group
"General"/1.