Viessmann VITOLADENS 300-W, Service Instructions For Contractors

Page: 67 / 108

67
Fault code
on the dis-
play System characteris-
tics Cause Measures
dE Control mode without
room influence Lead break, room
temperature sen-
sor, heating circuit
with mixer M2 Check the room tempera-
ture sensor, heating cir-
cuit with mixer M2 and the
remote control DIP switch
settings (see page 88).
E4 Burner blocked Supply voltage
fault Replace the control unit.
E5 Burner in a fault
state Internal fault Press "
E
".
Replace the control unit if
the burner will not restart.
E6 Burner in a fault
state The oil preheater
does not respond
inside the tolerated
time Check oil pre-heater and
supply line and replace if
necessary.
Press "
E
".
F0 Burner blocked Internal fault Replace the control unit.
F1 Burner in a fault
state Flue gas tempera-
ture limiter has
responded Check the heating system
fill level. Vent the system.
Press reset button "
E
"
after the flue gas system
has cooled down.
F2 Burner in a fault
state The temperature
limiter has respon-
ded 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
".
F3 Burner in a fault
state Flame signal is
already present at
burner start Check ignition electrodes,
electrode gaps and con-
necting cables.
Press "
E
".
Troubleshooting
Fault codes
(cont.)
5692 799 GB