Viessmann Vitodens 300 - Page 83

Displayed
fault c ode
Con-
st.
Weat -
her-
com-
p.
System
character-
istics
Cause Remedy
F0 X X Burner
blocked
Internal fault Replace control unit
F1 X X Burner in
fault state
Flue gas tem-
perature lim-
iter has
responded
Check the heatin g
system water level.
Vent the heating
system.
Press reset E no
sooner than after
20 minutes.
F2 X X Burner in
fault state
Temperature
limiter has
responded
Check the heatin g
system water level.
Check the circul a-
tion pump. Ven t t he
heating system.
Check the tempera-
ture limiter and
leads.
Press E.
F3 X X Burner in
fault state
The flam e sig-
nal is already
present a t b ur-
ner start
Check the ionisa-
tion electro de a nd
leads.
Press E.
F4 X X Burner in
fault state
No flame sig-
nal is prese nt
Check the ionisa-
tion electro de a nd
leads, m easure the
ionisation current,
check the g as pres-
sure, check the gas
combination valve,
ignition, ignition
module, ignition
electrodes and the
condensate drain.
Press E.
F7 X X Burner
blocked
Differential
pressure sen -
sor faulty
Check the press ure
differential sensor
and connecti ng lead
(see page 92)
Checking and acknowledging faults (cont.)
83
Troubleshooting
5692 537 GB