Operating instructions

ManualsBrandsViessmann ManualsBoilerType B2HA

118

Dis-

played

fault

code

Const. Weath.-

comp.

System char-

acteristics

Cause Measures

bE X Control mode

without remote

control

Communica-

tion error, re-

mote control

Vitotrol

heating circuit 3

(with mixer)

Check connec-

tions, cable, coding

address "A0" in

group "Heating

circuit" and re-

mote control set-

ting (see

page 156).

For wireless re-

mote controls:

Check connec-

tions, place remote

control unit close to

the boiler.

bF X Control mode Incorrect

LON commu-

nication mod-

ule

Replace LON com-

munication module

C1 X X Control mode Communica-

tion fault, ex-

tension EA1

Check connec-

tions

C2 X X Control mode Communica-

tion error, so-

lar control

module or

Vitosolic

Check solar control

module or

Vitosolic

C3 X X Control mode Communica-

tion fault, ex-

tension AM1

Check connec-

tions

C4 X X Control mode Communica-

tion fault,

OpenTherm

extension

Check OpenTherm

extension

Troubleshooting

Fault codes

(cont.)

5772 909 GB