Viessmann VITOLADENS 300-W Installation And Service Instructions Manual page 102

Troubleshooting
Fault codes
(cont.)
Displayed System characteris-
fault code tics
F2 Burner in a fault
state
F3 Burner in a fault
state
F4 Burner in a fault
state
F5 Burner in a fault
state
F6 Burner in a fault
state
F8 Burner in a fault
state
F9 Burner in a fault
state
FA Burner in a fault
state
102
Cause
Temperature limit-
er has responded.
Flame signal is al-
ready present at
burner start
Flame not estab-
lished at end of
safety time
The air pressure
switch does not re-
spond.
Fuel valves are not
actuated or no
feedback from fuel
valve BV 2
Fuel valve BV 1
closes late
Fan speed not
reached
Fan not at stand-
still
Measures
Check heating system fill
level. Check circulation
pump. Vent the system.
Check temperature limiter
and connecting cables.
Press reset button R.
Check ignition electrodes,
electrode gaps and con-
necting cables.
Press reset button R.
Check oil supply, ignition
electrodes, electrode
gaps and connecting ca-
bles.
Check nozzle and sole-
noid valve coil.
Correct all settings if re-
quired; clean all contami-
nated parts and replace
faulty components.
Press reset button R.
Check air pressure switch
and replace if necessary.
Press reset button R.
Check connecting cables
and plug-in connections
of the fuel valves or re-
place fuel valve BV 2.
Press reset button R.
Check nozzle, vent oil
line, check solenoid
valve.
Press reset button R.
Check fan, check con-
necting cables to fan.
Press reset button R.
Check fan, check con-
necting cables to fan.
Press reset button R.