Viessmann Vitoladens 300-W Installation And Service Instructions For Contractors page 71

Fault codes
(cont.)
Fault code dis- System characteristics
played
Ed 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
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
Cause
Oil pump motor PCB fault
Communication error,
burner control unit
Flue gas temperature lim-
iter has responded.
Temperature limiter has
responded.
Flame signal is already
present at burner start.
Flame not established at
end of safety time
The air pressure switch
does not respond.
Fuel valve is not actuated
or no feedback from fuel
valve
Fuel valve closes too late. Check nozzle; vent oil supply line;
Fan speed too low during
burner start.
Radial fan does not start.
CO limiter or fire safety
switch locked.
Troubleshooting
Measures
Check the connecting cable be-
tween control unit and oil pump
motor PCB and replace if necessa-
ry.
Press reset button R.
Replace the oil pump motor PCB if
necessary. Replace control unit if
required.
Replace control unit.
Check heating system fill level.
Vent the system.
Press reset button R after flue sys-
tem has cooled down.
Check heating system fill level.
Check circulation pump. Vent the
system. Check temperature limiter
and connecting cables.
Press reset button R.
Check ignition electrodes, elec-
trode gaps and connecting cables.
Press reset button R.
Check oil supply, ignition electro-
des, electrode gaps and connect-
ing cables.
Check nozzle and solenoid valve
coil.
Correct settings if required; clean
all contaminated parts and replace
faulty components.
Press reset button R.
Check air pressure switch and re-
place if necessary.
Press reset button R.
Check connecting cable and plug-
in connections of the fuel valve, re-
place fuel valve if necessary.
Press reset button R.
check solenoid valve.
Press reset button R.
Check fan, fan connecting cables
and power supply to fan; check fan
control.
Press reset button R.
If a fire safety switch or CO limiter
is installed, check whether one of
these safety mechanisms has re-
sponded.
If CO limiter has responded: check
flue system, boiler and trap for es-
caping flue gas.
71