Operating instructions

ManualsBrandsViessmann ManualsBoilerType B2HA

120

Dis-

played

fault

code

Const. Weath.-

comp.

System char-

acteristics

Cause Measures

Cd X X Control mode Communica-

tion error

Vitocom 100,

type GSM

(KM BUS)

Check connections

for Vitocom 100,

type GSM and cod-

ing address "95" in

group "General"

(weather-compen-

sated control units)

or group 1 (con-

stant temperature

control units)

CF X Control mode Communica-

tion fault,

LON commu-

nication mod-

ule

Replace LON com-

munication module

d6 X X Control mode Input DE1 at

extension

EA1 reports a

fault

Remove fault at

appliance con-

cerned

d7 X X Control mode Input DE2 at

extension

EA1 reports a

fault

Remove fault at

appliance con-

cerned

d8 X X Control mode Input DE3

fault at exten-

sion EA1

Remove fault at

appliance con-

cerned

dA X Control mode

without room

influence

Short circuit,

room temper-

ature sensor,

heating circuit 1

(without mix-

er)

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

Troubleshooting

Fault codes

(cont.)

5772 909 GB