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Fault code
in the dis-
play
Const.
Weat-
h.
comp.
System
character-
istics
Cause
Remedy
9C
X
X
Cylinder tempera-
ture sensor lead
break
9F
X
X
Control
mode
Solar control unit
error message
See solar
control unit
service
instructions
A7
X
Control
mode
Faulty operating
interface
Replace
operating
interface
b0
X
X
Burner
blocked
Flue gas tempera-
ture sensor short
circuit
Check the
flue gas tem-
perature sen-
sor (see
page 87)
b8
X
X
Flue gas tempera-
ture sensor break
b1
X
X
Control
mode
Communication
fault
–
program-
ming unit (internal)
Check con-
nections and
replace the
programming
unit, if neces-
sary
b4
X
X
Emissions
test mode
Internal error ana-
log converter
Replace con-
trol unit
b5
X
X
Control
mode
Internal error
Replace con-
trol unit
b7
X
X
Burner
blocked
Boiler coding card
missing, faulty or
incorrect card
inserted
Plug in the
boiler coding
card or
replace, if
faulty
bA
X
Mixer M2
continues
to move
Communication
fault - extension kit
for mixer circuit M2
Check the
extension kit
connections
and coding.
Start the
extension kit.
Checking and acknowledging faults
(cont.)
77
Troubleshooting
56
92
548
GB
Содержание VITODENS 333
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