Viessmann Vitoladens 300-C Service Instructions Manual page 65

Fault codes
(cont.)
Fault code System characteris-
on the dis- tics
play
CF Control mode
dA Control mode without
room influence
db Control mode without
room influence
dd Control mode without
room influence
dE Control mode without
room influence
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
Communication
fault, LON commu-
nication module
Short circuit, room
temperature sen-
sor, heating circuit
A1
Short circuit, room
temperature sen-
sor, heating circuit
with mixer M2
Lead break, room
temperature sen-
sor, heating circuit
A1
Lead break, room
temperature sen-
sor, heating circuit
with mixer M2
Supply voltage
fault
Internal fault
The oil preheater
does not respond
inside the tolerated
time
Internal fault
Flue gas tempera-
ture limiter has
responded
Troubleshooting
Measures
Replace the LON commu-
nication module.
Check the room tempera-
ture sensor, heating cir-
cuit A1.
Check the room tempera-
ture sensor, heating cir-
cuit with mixer M2.
Check the room tempera-
ture sensor, heating cir-
cuit A1 and the remote
control DIP switch set-
tings (see page 83).
Check the room tempera-
ture sensor, heating cir-
cuit with mixer M2 and the
remote control DIP switch
settings (see page 83).
Replace the control unit.
Press "E".
Replace the control unit if
the burner will not restart.
Check oil pre-heater and
supply line and replace if
necessary.
Press "E".
Replace the control unit.
Check the heating system
fill level. Vent the system.
Press reset button "E"
after the flue gas system
has cooled down.
65