Viessmann Vitodens 333-F Service Instructions Manual page 83

Fault codes
(cont.)
Fault Const. weath.-
code comp.
on the
display
dd X
dE X
E4 X X
E5 X X
E6 X X
E8 X X
E9 X X
System char- Cause
acteristics
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 Fault, supply
blocked voltage 24 V
Fault – flame
Burner
blocked amplifier
Burner System
blocked pressure too
low
Burner in a The ionisa-
fault state tion current
lies outside
the permissi-
ble range
Burner in a The ionisa-
fault state tion current
lies outside
the permissi-
ble range
during cali-
bration
Troubleshooting
Measures
Check the room
temperature sen-
sor, heating cir-
cuit A1 and the
remote control
DIP switch set-
tings (see
page 114)
Check the room
temperature sen-
sor, heating cir-
cuit with mixer M2
and the remote
control DIP switch
settings (see
page 114)
Replace the con-
trol unit.
Replace the con-
trol unit.
Top up with water.
Check the ionisa-
tion electrode and
cable.
Press "E
RESET".
Check the ionisa-
tion electrode and
cable.
Check the flue
gas system for
tightness.
Press "E
RESET".
83