Fault
code
on the
display
Const.
weath.-
comp.
System char-
acteristics
Cause
Measures
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 102).
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 102).
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
blocked
System
pressure too
low
Top up with water.
E8
X
X
Burner in a
fault state
The ionisa-
tion current
lies outside
the permissi-
ble range
Check the ionisa-
tion electrode and
cable.
Press "
E
RESET".
Fault codes
(cont.)
78
Troubleshooting
5692
673
GB
Summary of Contents for VITODENS 300-W
Page 111: ...Parts lists cont 111 Parts lists 5692 673 GB...
Page 112: ...Parts lists cont 112 Parts lists 5692 673 GB...
Page 113: ...Parts lists cont 113 Parts lists 5692 673 GB...
Page 114: ...Parts lists cont 114 Parts lists 5692 673 GB...
Page 121: ...121 5692 673 GB...
Page 122: ...122 5692 673 GB...
Page 123: ...123 5692 673 GB...
