Viessmann VITODENS 333 Service Instructions Manual page 77

Checking and acknowledging faults
Fault code Const.
in the dis-
play
9C X
9F X
A7
b0 X
b8 X
b1 X
b4 X
b5 X
b7 X
bA
Weat- System
h. character-
comp. istics
X
X Control
mode
X Control
mode
X Burner
blocked
X
X Control
mode
X Emissions
test mode
X Control
mode
X Burner
blocked
X Mixer M2
continues
to move
Troubleshooting
(cont.)
Cause Remedy
Cylinder tempera-
ture sensor lead
break
Solar control unit See solar
error message control unit
service
instructions
Faulty operating Replace
interface operating
interface
Flue gas tempera- Check the
ture sensor short flue gas tem-
circuit perature sen-
sor (see
page 87)
Flue gas tempera-
ture sensor break
Communication Check con-
fault – program-
nections and
ming unit (internal) replace the
programming
unit, if neces-
sary
Internal error ana- Replace con-
log converter trol unit
Internal error Replace con-
trol unit
Boiler coding card Plug in the
missing, faulty or boiler coding
incorrect card card or
inserted replace, if
faulty
Communication Check the
fault - extension kit extension kit
for mixer circuit M2 connections
and coding.
Start the
extension kit.
77