What To Do If; System Characteristics - Viessmann VITODENS 100-W Operating Instructions Manual

What to do if...

System characteristics

What to do if...?
... the heating system will
not start
... burner does not start
or starts irregularly
... burner is not started;
fault indicator " " appears
on display
burner is switched off
even though rooms are
not yet at the required
temperature
14
Cause
No mains voltage
Rotary selector " " is
set to "0".
Fuse in the power distri-
bution panel (domestic
mains fuse) or if the con-
trol unit has blown
No gas available
Control unit fault
False start
Low water
Fault in the combustion
air supply or flue gas
system
Heating water tempera-
ture or required room
temperature are set too
low
Air in the heating system Bleed radiators
Remedy
Switch the ON/OFF
switch ON
Setting the required heat-
ing water temperature
(see page 11)
Notify your heating con-
tractor
Open the gas shut-off
valve and if necessary
check with your gas sup-
plier
Check the fault code on
the display. Notify your
heating contractor of the
fault code.
Reset burner fault (see
page 6); if this attempt to
start also fails, notify your
heating contractor.
Notify your heating con-
tractor.
Notify your heating con-
tractor
Raise the heating water
temperature with rotary
selector " " (see
page 11) or raise required
room temperature (see
remote control operating
instructions)