Function Sequence And Possible Faults - Viessmann VITOLADENS333-F Service Instructions Manual

Further details regarding the individual steps
3. c press this button again,
"Außentemperatur" (outside
temperature) is displayed.

Function sequence and possible faults

Control unit is-
sues heat de-
mand
Yes
Oil preheating
starts
Yes
Fan starts after
no more than
10 min.
Green LED on
ignition transfor-
mer flashes.
Yes
The air pressure
switch responds
Commissioning, inspection, maintenance
4. b for the required language.
5. d to confirm.
Display screen
No
after approx.
10 min
No
Fault
E6
No Fault
F9
after approx. 51 s
No
Fault
F5
(cont.)
Measures
Increase set
value and ensure
heat is drawn off
Check the oil pre-
heater, cables
and plug-in con-
nectors
Check the oil pre-
heater, fan,
cables and plug-
in connectors
(the oil preheater
has not switched
through; the tem-
perature is not
achieved)
Check the air
pressure switch,
cables and plug-
in connectors
11