Function Sequence And Possible Faults - Viessmann Vitoladens 300-C Installation And Service Instructions Manual

Function sequence and possible faults

Control unit issues a heat
demand
Yes
Oil preheating starts
Yes
Fan starts after max.
10 min.
Green LED on ignition
transformer flashes.
Yes
Air pressure switch re-
sponds
Yes
Ignition and oil pump mo-
tor start
Yes
Solenoid valves open
Yes
Flame signal present
Symbol
A
Yes
Burner in operation.
The green LED on the ig-
nition transformer is per-
manently on (a flame is
detected).
For further details regarding faults, see page 80.
Display
No
No After approx. 10 min
Fault
E6
No Fault
F9
No After approx. 51 s
Fault
F5
No
No Fault
F4
No Fault
F4
Commissioning, inspection, maintenance
Measure
Increase set value and en-
sure heat is drawn off
Check the oil preheater,
cables and plug-in con-
nections (oil preheater has
not switched through; tem-
perature not reached)
Check the fan,
cables, plug-in connec-
tions and power supply
(fan speed not reached)
Check the air pressure
switch, cables and plug-in
connections
Check the ignition module
and oil pump motor, ca-
bles and plug-in connec-
tions
Check the oil supply;
check the solenoid valves
Check the ignition electro-
des, electrode gaps and
connecting cables
37