Viessmann VITOLADENS 300-W Installation And Service Instructions Manual page 101

Fault codes
(cont.)
Displayed System characteris-
fault code tics
db Control mode without
room influence
dC Control mode without
room influence
dd Control mode without
room influence
dE Control mode without
room influence
dF Control mode without
room influence
E0 Control mode
E4 Burner blocked
E5 Burner in a fault
state
E6 Burner in a fault
state
F0 Burner blocked
F1 Burner in a fault
state
Cause
Short circuit, room
temperature sen-
sor, heating circuit
2 (with mixer)
Short circuit, room
temperature sen-
sor, heating circuit
3 (with mixer)
Lead break, room
temperature sen-
sor, heating circuit
1 (without mixer)
Lead break, room
temperature sen-
sor, heating circuit
2 (with mixer)
Lead break, room
temperature sen-
sor, heating circuit
3 (with mixer)
Fault, external
LON subscriber
Fault, supply volt-
age 24 V
Fault, flame ampli-
fier
Oil preheater does
not respond inside
tolerated time
Communication er-
ror, burner control
unit
Flue gas tempera-
ture limiter has re-
sponded
Troubleshooting
Measures
Check room temperature
sensor, heating circuit 2
Check room temperature
sensor, heating circuit 3
Check room temperature
sensor for heating circuit 1
and remote control set-
tings (see page 127)
Check room temperature
sensor for heating circuit 2
and remote control set-
tings (see page 127)
Check room temperature
sensor for heating circuit 3
and remote control set-
tings (see page 127)
Check connections and
LON subscribers
Replace control unit
Press reset button R.
Replace the control unit if
the burner will not restart.
Check oil preheater and
supply line and replace if
necessary.
Press reset button R.
Replace control unit
Check heating system fill
level. Vent the system.
Press reset button R after
flue system has cooled
down
101