Viessmann Vitoladens 300-W Service Instructions For Contractors page 67

Fault codes
(cont.)
Fault code System characteris-
on the dis- tics
play
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
F2 Burner in a fault
state
F3 Burner in a fault
state
Cause
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
The temperature
limiter has respon-
ded
Flame signal is
already present at
burner start
Troubleshooting
Measures
Check the room tempera-
ture sensor, heating cir-
cuit with mixer M2 and the
remote control DIP switch
settings (see page 88).
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.
Check the heating system
fill level. Check the circu-
lation pump. Vent the sys-
tem. Check the tempera-
ture limiter and connect-
ing cables.
Press "E".
Check ignition electrodes,
electrode gaps and con-
necting cables.
Press "E".
67