Function Sequence And Possible Faults - Viessmann VITOLADENS 300-W Installation And Service Instructions Manual

Further details regarding the individual steps

Function sequence and possible faults

Control unit is-
sues a heat de-
mand
yes
Oil preheating
starts
yes
Fan starts after no
more than
10 min.
Green LED on ig-
nition transformer
flashes.
yes
The air pressure
switch responds
yes
Ignition and oil
pump motor start
Commissioning, inspection, maintenance
Display
no
after approx.
no 10 min
Fault
E6
no Fault
F9
no after approx. 51 s
Fault
F5
no
(cont.)
Measures
Increase set value
and ensure heat is
drawn off
Check the oil pre-
heater, lines and
plug-in connec-
tions (oil preheater
has not switched
through; tempera-
ture not reached)
Check fan,
check cables, plug-
in connections and
power supply
(fan speed not
reached)
Check the air pres-
sure switch, cables
and plug-in con-
nections
Check the ignition
module and oil
pump motor, ca-
bles and plug-in
connections
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