Operating instructions

ManualsBrandsViessmann ManualsBoilerWS3A

Fault code

in the dis-

play

Const. Weat-

h.

comp.

System

character-

istics

Cause Remedy

C6 X Control

mode,

max. pump

speed

Communication

fault - variable

speed heating ci r-

cuit pump, heating

circuit M2

Check coding

address E5

settings;

check the

heating cir-

cuit pump

DIP switch

settings

C7 X X Control

mode,

max. pump

speed

Communication

fault - variable

speed heating ci r-

cuit pump, heating

circuit A1

Check coding

address E5

settings;

check the

heating cir-

cuit pump

DIP switch

settings

Cd X X Control

mode

Communication

fault Vitocom 100

(KM BUS)

Check the

Vito com 100

and connec-

tions

CE X X Control

mode

Communication

error - ext. exten-

sion

Check con-

nections and

coding

address 2E

settings.

CF X Control

mode

Communications

fault - LON commu -

nication module

Replace the

LON commu-

nication mod-

ule

dA X Control

mode with-

out room

influence

Room temperature

sensor hea ting cir-

cuit A1 shorted out

Check the

room tem-

perature sen-

sor - heating

circuit A1

db X Heating circuit M2

room temperature

sensor shor ted out

Check the

room tem-

perature sen-

sor - heating

circuit M2

Checking and acknowledging faults (cont.)

79

Troubleshooting

5692 548 GB