Viessmann Vitoplus 300 - Page 73

Display fault
code
System char-
acteristics
Cause Measures
F1 Burner control
unit fault
Flue gas temperature lim-
iter has responded
Check the heating
system fill level.
Vent the system.
Press reset
"E"no sooner
than after 20 min-
utes.
F2 Burner control
unit fault
The temperature limiter
has responded
Check the heating
system fill level.
Check the circula-
tion pump. Vent
the system.
Check the tem-
perature limiter
and connecting
cables.
Press "E".
F3 Burner control
unit fault
Flame signal is already
present at burner start
Remove external
light ingress.
Press "E".
F4 Burner control
unit fault
The flame is not estab-
lished at the end of the
safety period
Check the oil sup-
ply,
check the flame
monitor,
check the nozzle,
check the sole-
noid valve coil.
Correct all set-
tings, if required,
clean all contami-
nated parts and
replace faulty
components.
Press "E".
F5 Burner control
unit fault
The air pressure switch
does not respond
Checking and re-
placing the air
pressure switch, if
required.
Press "E".
Fault codes (cont.)
73
Troubleshooting
5692 536 GB