Operating instructions

ManualsBrandsViessmann ManualsDomestic AppliancesVitodens 222-F

109

Dis-

played

fault

code

Const. Weath.-

comp.

System char-

acteristics

Cause Measures

CE X X Control mode Communica-

tion error, ext.

extension

Check electrical

connections

CF X Control mode Communica-

tion error,

LON commu-

nication mod-

ule

Replace the LON

communication

module

d6 X X Control mode Input DE1

reports a fault

at extension

EA1

Remove fault at the

appliance con-

cerned

d7 X X Control mode Input DE2

reports a fault

at extension

EA1

Remove fault at the

appliance con-

cerned

d8 X X Control mode Input DE3

reports a fault

at extension

EA1

Remove fault at the

appliance con-

cerned

dA X Control mode

without room

influence

Short circuit,

room temper-

ature sensor,

heating circuit

1 (without

mixer)

Check room tem-

perature sensor,

heating circuit 1

db X Control mode

without room

influence

Short circuit,

room temper-

ature sensor,

heating circuit

2 (with mixer)

Check room tem-

perature sensor,

heating circuit 2

dC X Control mode

without room

influence

Short circuit,

room temper-

ature sensor,

heating circuit

3 (with mixer)

Check room tem-

perature sensor,

heating circuit 3

Troubleshooting

Fault codes

(cont.)

5457 552 GB

Service