Viessmann VITODENS 333 Service Instructions Manual page 81

Checking and acknowledging faults
Fault code Const.
in the dis-
play
F2 X
F3 X
F4 X
Weat- System
h. character-
comp. istics
X Burner in
fault state
X Burner in
fault state
X Burner in
fault state
Troubleshooting
(cont.)
Cause Remedy
Temperature limiter Check the
has responded heating sys-
tem water
level. Check
the circula-
tion pump.
Vent the heat-
ing system.
Check the
temperature
limiter and
leads.
Press E.
The flame signal is Check the
already present at ionisation
burner start electrode and
leads.
Press E.
No flame signal is Check the
present ionisation
electrode and
leads, mea-
sure the ioni-
sation cur-
rent, check
the gas pres-
sure, check
the gas com-
bination
valve, igni-
tion, ignition
module, igni-
tion electro-
des and the
condensate
drain.
Press E.
81