Viessmann VITODENS 300 Service Instructions Manual page 81

Fault codes
(cont.)
Display Const. Weath.-
fault comp.
code
Ed X X
F0 X X
F1 X X
F2 X X
F3 X X
F4 X X
System char- Cause
acteristics
Burner control Internal fault
unit fault
Burner Internal fault
blocked
Burner control Flue gas
unit fault temperature
limiter has
responded.
Burner control The tem-
unit fault perature lim-
iter has
responded.
Burner control Flame signal
unit fault is already
present at
burner start.
Burner control No flame sig-
unit fault nal.
Troubleshooting
Remedy
Replace the con-
trol unit.
Replace the con-
trol unit.
Check the heating
system fill level.
Vent the system.
Press reset but-
ton "E" after the
flue gas system
has cooled down.
Check the heating
system fill level.
Check the circula-
tion pump. Vent
the system.
Check the tem-
perature limiter
and connecting
cables.
Press "E".
Check the ionisa-
tion electrode and
lead.
Press "E".
Check the ionisa-
tion electrode and
lead, measure the
ionisation current,
check the gas
pressure, check
the gas combina-
tion valve, igni-
tion, ignition
module, ignition
electrodes and
the condensate
drain.
Press "E".
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