Fault
code
on the
display
Const.
Weath.-
comp.
System char-
acteristics
Cause
Measures
dA
X
Control mode
without room
influence
Room tem-
perature
sensor, heat-
ing circuit A1
shorted out
Check the room
temperature sen-
sor, heating cir-
cuit A1
db
X
Control mode
without room
influence
Room tem-
perature
sensor, heat-
ing circuit
with mixer
M2 shorted
out
Check the room
temperature sen-
sor, heating cir-
cuit with mixer M2
dd
X
Control mode
without room
influence
Room tem-
perature
sensor, heat-
ing circuit A1
lead broken
Check the room
temperature sen-
sor, heating cir-
cuit A1 and the
remote control
DIP switch set-
tings (see
page 105)
dE
X
Control mode
without room
influence
Room tem-
perature
sensor, heat-
ing circuit
with mixer
M2 lead bro-
ken
Check the room
temperature sen-
sor, heating cir-
cuit with mixer M2
and the remote
control DIP switch
settings (see
page 105)
E4
X
X
Burner
blocked
Fault, supply
voltage 24 V
Replace the con-
trol unit
E5
X
X
Burner
blocked
Fault, flame
amplifier
Replace the con-
trol unit.
E6
X
X
Burner in a
fault state
Balanced
flue system
blocked
Check the ba-
lanced flue sys-
tem and
differential pres-
sure sensor;
press "
E
"
Fault codes
(cont.)
79
Troubleshooting
5692
731
GB
Summary of Contents for VITODENS 333-F WS3A
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