Viessmann VITOLADENS333-F Service Instructions Manual page 12

Commissioning, inspection, maintenance
Further details regarding the individual steps
Yes
Ignition and oil
pump motor start
Yes
The solenoid
valves open
Yes
Flame signal pre-
sent
Symbol A
Yes
Burner in opera-
tion.
The green LED
on the ignition
transformer is
permanently on
(a flame is recog-
nised).
For further details regarding faults,
see page 68.
12
No
Fault
No
F4
Fault
No
F4
(cont.)
Check the ignition
module and oil
pump motor,
cables and plug-
in connectors
Check the oil sup-
ply; check the so-
lenoid valves
Check ignition
electrodes, elec-
trode gaps and
connecting lines