Viessmann Vitodens 333 Service Instructions Manual page 80

Troubleshooting
Checking and acknowledging faults
Display Const.
fault code
E5 X
E6 X
F0 X
F1 X
F2 X
80
Weat- System
h. character-
comp. istics
X Burner
blocked
X Burner in
fault state
X Burner
blocked
X Burner in
fault state
X Burner in
fault state
(cont.)
Cause Remedy
Internal fault Check ionisa-
tion electrode
and leads.
Check flue
gas system
for sound-
ness.
Press E.
Flue gas/air supply Check flue
system blocked gas/air supply
system.
Check differ-
ential pres-
sure sensor.
Press E.
Internal fault Replace con-
trol unit
Flue gas tempera- Check heat-
ture limiter has re- ing system
sponded water level.
Vent heating
system.
Press reset
button E
after flue gas
system has
cooled down.
Temperature limiter Check heat-
has responded ing system
water level.
Check circu-
lation pump.
Vent heating
system.
Check tem-
perature limit-
er and leads.
Press E.