Viessmann Vitodens 333 Service Instructions Manual page 77

Fault codes
(cont.)
Fault Const. Weath.-
code in comp.
the dis-
play
E6 X X
F0 X X
F1 X X
F2 X X
F3 X X
F4 X X
F7 X X
System char- Cause
acteristics
Burner fault Flue gas/
ventilation
system
blocked
Burner Internal fault
blocked
Burner fault Flue gas
temperature
limiter has
responded
Burner fault The tem-
perature lim-
iter has
responded
Burner fault Flame signal
is already
present at
burner start
Burner fault No flame sig-
nal.
Burner Differential
blocked pressure
sensor faulty
Troubleshooting
Remedy
Check the flue
gas/ventilation
system and differ-
ential pressure
sensor; press "E"
Replace control
unit
Check flue gas
path/route, press
"E"
Check the heating
system fill level,
the circulation
pump, the tem-
perature limiter
and interconnect-
ing cables/leads;
ventilate the sys-
tem; press "E"
Check the ionisa-
tion electrode and
interconnecting
leads; press "E"
Check the ionisa-
tion electrode,
ignition, ignition
module, intercon-
necting cables
and leads, gas
pressure, gas
combination valve
and the ionisation
current; press
"E"
Check differential
pressure sensor
and lead
77