Viessmann VITODENS 200-W WB2B Service Instructions For Contractors page 76
80 and 105 kw, wall mounted gas fired condensing boiler, natural gas version
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Also See for VITODENS 200-W WB2B:
- Installation instructions manual (92 pages) ,
- Start-up/service instructions (82 pages) ,
- Technical data manual (44 pages)
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Troubleshooting
Fault codes
(cont.)
Fault
Const.
Weath.-
code
comp.
on the
display
CF
X
dA
X
db
X
dd
X
dE
X
E4
X
X
76
System char-
Cause
acteristics
Control mode
Communica-
tion fault,
LON com-
munication
module
Control mode
Room tem-
without room
perature
influence
sensor, heat-
ing circuit A1
shorted out
Control mode
Room tem-
without room
perature
influence
sensor, heat-
ing circuit
with mixer
M2 shorted
out
Control mode
Room tem-
without room
perature
influence
sensor, heat-
ing circuit A1
lead broken
Control mode
Room tem-
without room
perature
influence
sensor, heat-
ing circuit
with mixer
M2 lead bro-
ken
Burner
Supply vol-
blocked
tage fault
Measures
Replace the LON
communication
module.
Check the room
temperature sen-
sor, heating cir-
cuit A1.
Check the room
temperature sen-
sor, heating cir-
cuit with mixer
M2.
Check the room
temperature sen-
sor, heating cir-
cuit A1 and the
remote control
DIP switch set-
tings (see
page 101).
Check the room
temperature sen-
sor, heating cir-
cuit with mixer M2
and the remote
control DIP switch
settings (see
page 101).
Replace the con-
trol unit.
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