Operating instructions

ManualsBrandsViessmann ManualsBoilerWS3A

Fault code

in the dis-

play

Const. Weat-

h.

comp.

System

character-

istics

Cause Remedy

bC X Control

mode with-

out remote

control

Communication

fault - Vitotrol

remote control

heating circuit A1

Check con-

nections,

cable, coding

address A0

and the

remote con-

trol DIP

switches

bd X Control

mode with-

out remote

control

Communication

fault - Vitotrol

remote control

heating circuit M2

bE X Control

mode

Vitotrol remote

control incorrectly

encoded

Check the

DIP switch

settings of

the remote

control

bF X Control

mode

Incorrect LON com-

munication mod ule

Replace the

LON commu-

nication mod-

ule

C2 X X Control

mode

Communication

fault - solar contro l

unit

Check con-

nections and

coding

address 54.

C5 X X Control

mode,

max. pump

speed

Communication

error - variable

speed internal

pump

Check coding

address 30

settings;

check the

heating cir-

cuit pump

DIP switch

settings.

Checking and acknowledging faults (cont.)

78

Troubleshooting

5692 548 GB